Don't be too intense, though. That can look like you're trying too hard. Also keep your face relaxed without too many animated expressions. If your face is going a mile a minute in everything she says, that can be distracting. Girls usually have lots of feelings about things, and this gives her a chance to express them versus keeping them bottled up inside. If you sense that a situation was frustrating, difficult or upsetting, let her know. Even if she doesn't say anything, she'll notice and appreciate it. It's okay to not understand every aspect of a situation but don't say that her feelings are wrong because feelings can never be wrong. Be careful to not blame her either when she shares something with you. Strive to be empathetic, not judgmental or overly harsh. Turn your cell phone off. Don't look around the room or at other people. Listening well is an art form, and many people are poor listeners. Go the extra mile here. It will pay dividends in making her feel good. Females secrete a feel-good hormone when expressing their feelings. By sharing things with you, she can't help but also feel good about you. The more comfortable she is in talking to you, the safer she will feel, too, in opening up. Along with eye contact, show active listening skills by nodding your head and saying things that confirm you hear her like "I would feel the same way myself" or "I can see why you would feel that way." Don't interrupt. Many people also find this difficult when listening to others. You will go far in making her feel good by waiting until she's completely finished before commenting. This also goes both ways. When it's your turn to talk, she'll listen better to you, too. This can be challenging because it's natural to want to immediately try and solve matters. First and foremost, though, she needs to feel heard. Jumping in with what you think is best could make her feel that you don't trust her in solving them. So let her express herself and ask what she thinks is best. This will boost her confidence in situations, and she'll appreciate this quality in you, too. The more you understand where she is with an issue, the more she will trust that you can help her solve it. But wait until she asks before automatically giving your opinion. When you do give it, be thoughtful about it. Think what it's like to be in her shoes before commenting. Sometimes what people say or how they say it can be humorous to the person listening. Pay attention to her body language. If she's serious, then trust that it's a serious matter. If you're condescending, she could think you don't understand her at a deeper level, not just that situation.
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One-sentence summary -- Make eye contact when listening. Ask her how particular situations make her feel. Give her your undivided attention, ignoring distractions. Let her know you are listening through your gestures. Don't offer solutions to her problems. Resist mocking, laughing or being sarcastic.

Every Medic possesses a 40/150 Syringe Gun (Primary), the class defining Medi-Gun (Secondary) and their last resort, the Bonesaw (Melee). They may also unlock a series of alternate weapons by successfully completing Medic Achievements. Use the Bonesaw sparingly, at point-blank range. Melee kills are always fun, and melee weapons have taken quite a boost in power since the Team Fortress Classic (TFC) crowbar, but don't get cocky. Save your Bonesaw for stealthy strikes from behind, or if your attacker is right next to you and retreating isn't an option. Otherwise, you're usually better off healing another teammate and letting them finish the job for you instead. Use the Syringe Gun for distance shots. As the name implies, the Syringe Gun fires hypodermic needles. It is not the most powerful weapon in TF2, but it is often underestimated by most players. An experienced player can be lethal with the Syringe Gun in their hands. Note that the needles from the Syringe Gun actually fire slightly to the right of where the crosshair is. Fire at a wall from varying distances and look where the needles land to get a feel of where to aim. They also arc downward rather quickly. You'll need to aim upward and to the left with the Syringe Gun if you intend to hit any enemies from a distance. This does, however, make it useful to shoot over short hills. The Syringe Gun's needles travel through the air slowly, which can make them easy for other players to dodge them. Keep this in mind. Try using the Syringe Gun to provide cover fire for your team. They'll stay in the air long enough to travel at enemies that like to sidestep back and forth from corners. Since the Syringe Gun's projectiles move through the air slowly, it is a good strategy to fire if an enemy is chasing you, with you either standing still, moving towards him, or backtracking. If he moves towards your syringes, he is more likely to get hit and thus die. This is essentially a given; your teammates will respect you for being able to heal them effectively and quickly. The biggest change to the Medic since TFC is his ability to heal from a distance. You can now space yourself out from between your teammate as you heal them to avoid splash damage. You don't have to keep your crosshairs on the player to keep healing them, so you should look around frequently to keep an eye on the rest of the battlefield; it's a good idea to look for other wounded players, and keep an eye out for approaching Spies and Pyros. In addition to healing, your Medi Gun can raise a player's health to 150% more of their maximum health. This will slowly return back to its maximum when you stop healing them. You can tell how "overhealed" a player is by the white glowing/pulsating surrounding his or her health cross; the bigger this glow, the more over healing they have received. You will earn an "assist kill" if you are healing a teammate that gets a kill point. As you heal players, you will notice that the small bar on the bottom right corner of your HUD will start to fill itself. This is your UberCharge meter. When this reaches 100%, the Medic will announce that he is "charged". By right-clicking, you will activate the UberCharge, which will make you and your healing target completely invulnerable for a maximum of 8 seconds Note that you and your target cannot capture points when Uber Charged. Similarly, you and your target will not be able to carry the enemy intelligence (flag). However, you can still prevent the enemy team from taking a capture point while UberCharged. Your UberCharge meter will fill fastest when healing a damaged player. It fills slowest when over healing a player who is already at 150% of their maximum health. This gives Medics an incentive to take care of his team as a whole, rather than to attach themselves to the nearest Heavy. The announcement of "I am charged!" can be heard by nearby enemies. If you wish to cover up this tell-tale signal so they are less likely to be prepared for it, you can call for a Medic (or any other vocal command) just as the meter reaches 100%, and it will override the passive "I am charged!" announcement.
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One-sentence summary --
Get to know his weapons. Use the Medi Gun to heal your teammates. Use your UberCharge to make you and one of your teammates invincible for a short time.