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Give her a look. Take possession of your boyfriend. Emphasize your togetherness with words. Comment on it. Pull her aside. Avoid the situation. Take it in stride.
The easiest way to send a message to someone flirting with your boyfriend is to simply take her down with a look. Stare her down without a smile until she backs away. If she doesn't get the message, you need to move on to other tactics. When she starts flirting, let her know he's your boyfriend by physically touching him. Wrap your arm around his shoulders, or curve your arm into his, grabbing his hand. Lean your head on his shoulder. These subtle movements will tell her to back off. Another way to stake your territory is to use your words to emphasize you are together. For instance, if a girl asks what your boyfriend is doing next weekend, say, "Oh, we're going to see a movie together. It's our favorite movie, isn't it honey?" Emphasizing "we" and "our" will help most people get the message. Establishing other types of intimacy, such as having a shared favorite movie, also emphasizes you're together. If the girl is obviously flirting, one way to point it out without actually being mean to make a lighthearted comment about it. That way, you call attention to the situation, so you are doing something about it, but you aren't lashing out and creating a sticky situation. For example, say the girl is laughing too much at your boyfriend's jokes. You could say something like, "Well, that was funny, but not that funny! He's always making bad puns." If you don't want to cause a scene, you may need to draw her aside to talk about it. This tactic might work better with someone you know rather than a stranger. If she doesn't respond to other measures, ask if you can talk to her for a minute, then bring up the problem. For example, you could say, "You may not realize that you're doing it, but you're flirting with my boyfriend. I find it really disrespectful, and I would appreciate it if you would stop." When you become aware that your boyfriend always gets flirted with when you're in certain situations, maybe you should start avoiding that situation. For example, if you notice your boyfriend constantly gets flirted with when you go to the club, maybe it's better to skip going to the club all together. Another option is to avoid the person. If it's someone you know who's flirting with your boyfriend, stop meeting up with that person if at all possible. Another option is to simply ignore the flirting. If your boyfriend is ignoring the girl, there's no reason that you can't do that, too. In addition, the flirting may make your boyfriend more excited to be with you, so you can enjoy time together later.