It's better to set rules for yourself

Before things get out of hand. You need to have certain rules in your life, like:

- If a girl flakes on you twice, cut her off.

- If a friend isn't spending time with you or respecting you, give it three weeks, depending, then cut them off.

- Stop giving a fuck

etc

I think this could save one's sanity instead of suffering for people who aren't worth it.