If someone betrays you, that is not a friend. I would not trust anyone who betrayed me. And I would most certainly not label them a friend. Here it seems more than one person betrayed you. I would disengage from such a group.

It might help you get it off your heart, if you told whoever betrayed you the impact on you. Their response might help you either detach from this group who don't seem to be your people anyway or tolerate them (because trust has been broken pretty badly, already) if you need human connection.

As for new people or potential new friendships, give it time. Keep your distance and do not give your trust until it is earned.