People who i've been friends with for years. Helped them grown into better people and learned them valuable stuff. Also introduced them to each other. But as soon as they could backstab me and ditch me they had no problems doing so.

Those friends introduced me to a new friend group. But the guys in there didn't like me. So they ended up ditching me for those friends. Even though these people are losers, and the people i've introduced them to are much more valuable.

Why are people like this? It makes me lose hope in humanity. I've already been fucked over by my own parents and other family members in the past so this doesn't help my current situation at all.