Aw I'm sorry this made you sad. Don't stop trying to make friends though. I just simply don't expect friendships and even those in relationships to last long until proven otherwise. And I'm glad I'm not the only one who is attentive of not just how someone treats me, but how someone treats others. In fact, in a lot of cases, my observations of how someone treats others is what makes me think about how they really are and how they could potentially treat me. Not everything negative that I've mentioned people can do has happened to me. In a lot of cases, I just saw it happen to someone else or even multiple people and I'll be thinking, "Uh oh, that could happen to me too. Better maintain some distance from this person."

Unless there's a very good reason for it, usually if someone treats others a certain way, then they will treat you. The only time I may disregard it is if someone treats just one other person a certain way but is nicer to everyone else. IN that case, that could just indicate bad blood. But when it seems like someone treats anyone else the same way, then that is a sign that's just how they are and they will do the same thing to you. I think the fact that I'm an introvert makes me way more attentive to how other people behave and I tend to see things more or faster than others around me do. I'll notice something in someone's behavior but they won't see it until it's too late.