Article in English: You can say something nice or make small talk first, but there's no use in prolonging the pain. After a minute or two, once you and the girl have settled in, you should just tell her that you want to end the relationship. The longer you sit there, the more nervous you'll get, and the more likely you are to get off track. If you and the girl make small talk for twenty minutes before you break up with her, then you'll be much more likely to confuse her. Just take a deep breath and tell her that it's over as nicely as possible. Here are some things that you can say:  "I'm sorry to say that I think our relationship has run its course. We'd both be happier if we moved on." "This relationship is no longer working for me. I know we've tried everything, and it just won't get better." "It may not be a surprise that I haven't been happy in this relationship for a while. I really care about you, but I just don't think we should date anymore." If you really don't care at all, then there's no point in faking it. But if the break up really is hurting you, then make sure she sees it. Look into her eyes, talk slowly, and let her see the pain on your face. Most people don't think that the person doing the dumping also feels pain in a break up, but both people actually suffer. If she sees that you're not making an easy, careless decision that means nothing to you, then she'll have a better chance of understanding where you're coming from. If you care about the girl, give her the respect she deserves and let her tell you how she feels, ask questions, and share her feelings. She may just want to cry and be upset, and that's okay. She may start name-calling and getting angry -- in that case, you may need to wrap things up. If she's rambling on about the same thing over and over, then you can cut her off, but if she genuinely wants to share her feelings and is really hurt, then do her the kindness of letting her talk to you. She'll likely have some questions for you, and you can decide how much you want to explain. If you've...

Summary in Chinese:
直奔重点。 让她看到你也同样心碎。 让她倾诉。 想解释多少就解释多少。 绝不松口。 保持风度。 说的简短，说的漂亮。 尽量好聚好散。