...is that you are the one that brought those people into your life. If all you do is to break off with bad friends, you’re just creating an empty space to fill with future bad friends.

The people you have around you are a function of the person that you are. Deal with yourself. Assume that you are the source; creating the friend-situations which are causing grief. Work out why that is happening.

If your answer sounds like “well, I seem to like jerks”, you are missing the point.

If your answer sounds like “I have no self-esteem, mostly because I am a selfish jerk.”, you are getting close.

It is not a pleasant thing to do at first, but it is ultimately liberating. And it is the way that works.