You have to let things like that out. The longer you keep them bottled in, the longer it'll hurt. Things like that don't go away, time only makes them worse. The more you tell yourself "It doesn't matter, it's no big deal, I'll forget about it", the smaller the chance is that you'll actually forget it. You can't ignore things like that and pretend they don't exist and make them go away. Believe me, I've tried for years. It only makes it hurt more. The longer you let it hurt, the more it will hurt, until eventually you'll get to a point where you don't care about anything anymore and you don't trust anyone. Then you'll be alone against all of that pain that you spent so much time trying to ignore, with all of the tiny different ways that you tried to make things better, trying and trying and just hoping that things would get better, but they didn't. They only got worse.