Well, even if they are, why bother? I'm sure even you have people important to you. Go give them all your attention and be happy in the process instead of letting those dicks bring you down.
Then they weren't worth it. We make mistakes in our judgment all the time. You can't really help that. I make loads of mistakes too. I had people betray my trust and cared shit about my thoughts too. The only way to avoid mistakes is to not do anything at all. That's not really life.
So just deal with it and find people who are really important.