Fall in love with the bad guy. When he leaves, you'll have seen it coming. You always thought about it. You'll think about the time he avoided you because he didn't want to get sick. You'll remember everything he did wrong. He left, and hating him comes easy.
Always fall in love with the bad guy. You won't want anything to do with him, and that's good because he's not sticking around. You can remind yourself you shouldn't have fallen in love because you knew how the story would end.
If you fall in love with the good guy. You won't hate him when he leaves. You won't even think about it. Instead, you'll think about the time he brought you flowers when you were sick. You'll remember the time he remembered little details about him. You'll think about everything he did right and nothing he did wrong. He left, but loving him still feels so easy.
Don't fall in love with the good guy. When he breaks it off, he'll insist you can still work as friends. You won't be able to say no because there's just something about him. There's something about being around him that makes you happy. However, being around him one every few weeks will never be enough. Being his friend will never be enough.
Avoid falling in love with the good guy. He'll never be anything but the boy you fell in love with. You'll never know him as anything but the person he was with you. You'll never fall out of love with the things that pulled you in in the first place.
So I repeat: Never, ever fall in love with the good guy because, when he leaves, you will not see it coming. You can't tell yourself you knew the story would end. So don't fall in love with the good guy.