Summarize this article:

If you want to tell someone who means well to leave you alone, then it's important to find a nice, quiet place to do it. Whether the person is someone who has a crush on you or just an annoying classmate, if you feel comfortable around the person, then you should try to tell him or her in a quiet place where you can be alone without the threat of someone coming in and asking what's happening. You should also find a time when the person you want to talk to isn't distracted, busy, or stressed out, so the conversation goes as well as it can. Though it's important to find a good place and time if you care about the person you're talking to, you also shouldn't wait around forever for the perfect time to come along. It's important to get the message across so you can both move on with your lives. If you feel more comfortable having a friend there for support, then that's fine too. Don't put yourself in an uncomfortable situation if you'd rather not be alone with the person. Once you get the person alone, it's important to be open and honest about the fact that you want to be left alone. If the person has a crush on you and you don't return those feelings, then say so. If the person is your neighbor or classmate who always wants to hang out and you're just not interested, then get the point across. Say it loud and clear so there can be no mistake that you just don't want to see the person. For example, if the person is a girl who has a crush on you, you can say, "I'm sorry that I don't return your feelings. I'm flattered, but I'd like to be on my own." If the person is an annoying person who keeps trying to hang out with you, just say, "I'm sorry, but I'm just not interested in spending time with you. I thought you should know." If the person has actually done things to annoy you or make your life difficult or if you've already given him or her a few chances, then you can say this to get the message across. If you're nervous about what to say here, then practice in advance. It's natural to be a little bit, or very, upset when you have this kind of conversation. However, if you want to get the message across, then the best thing you can do is try to remain calm and keep your wits about you. If you feel yourself getting emotional, take a deep breath, and give yourself some time to return to your senses. If you keep your cool, then the person will see that he can't mess with you and that he should take you seriously. You want to look like you have it together. If need to take deep breaths or even need to excuse yourself for a minute to get the message across, then don't be afraid to do so. If the other person gets mad and says things to taunt you or make you upset, don't let it get to you. Don't stoop to that person's level and fight back and take the high road instead. Though you may think it's better to make excuses to soften the blow, if you say things like, "Now is not a good time for me" or "I'm just not ready to date, but I really like you," then you'll just be giving the person false hope. Instead of doing this, telling the person that you're honestly not interested will make it much more likely that the person will get the message and will leave you alone. And what's more, you won't be hurting the person's feelings as much. Of course it'll be easier to make an excuse in the moment than to be direct. But if you do that, then you won't be getting the message across and the person will come right back to you. If someone is just plain mean to you, you can say so. Say, "I don't want to hang out with you anymore because you always end up making fun of me. I really don't appreciate it and would like to be left alone." If the person is genuinely nice, then you shouldn't try to hurt his or her feelings more than you need to. It can be tricky to find a balance between getting your point across and being sensitive, but you should work to make it clear you don't want to spend time with the person without name-calling or being insulting. You want to be better than that. Besides, you want to end the relationship, whatever it may be, not fuel the fire and lead the person to keep bothering you for even longer. If a girl likes you and you don't return her feelings, you can be honest about the fact that you don't feel the same way without explaining that she's just not your type and that you like girls who are taller, or saying that you think she's annoying. If the person is a younger sibling, while you can't get him or her to leave you alone forever, you can say something like, "I'd really like some privacy while I hang out with my friends. You're getting in the way right now." If you respect the person and he or she has something to say, then you should give him and her the chance to talk. As long as the person is emotionally stable and just genuinely likes you a lot, he or she may want you to listen for a little while. If you want to be nice, then give the person this allowance, taking the time to really pay attention. Though you shouldn't make this last more than a few minutes, if you care about the person even a little bit, then can take this time to listen. Don't interrupt or offer your own opinions. Wait for the person to say what he or she has to say, respond as kindly as you can, and get ready to end the conversation. Before you end the conversation, it's important to ask the person if he's clear on the fact that you are to be left alone. You want to make sure that your words had a lasting effect and that your message was received loud and clear. You can even see if the person will repeat that he'll leave you alone so he sees that you're serious and that you weren't just having the conversation for fun. Before you leave the conversation, you should make sure that the person understanding in no uncertain terms that you are to be left alone. If the conversation has gone reasonably well, then try to end it on a good note. Thank the person for hearing you out and understanding that you want to be left alone. This conversation was likely pretty difficult for both of you, and you should try to wrap it up positively, given the context. Of course, it can't be too positive if you're asking to be left alone, but you can try to be as nice as possible. Though you may not feel like saying thank you, it's only polite, and it may lead you to have a better understanding with the other person.

Summary:
Find the right time and place to tell the person. Explain why you want to be left alone. Remain calm. Don't make excuses. Be honest but not hurtful. Let the person talk. Make sure the person understands what you're asking. Thank the person for talking to you.