would you rather be unhappy but with your bestfriend
or without your best friend?
the scenario is that they are treating you not so good and changing but you cant let go because of like 4 years of memories and you have spoken to them for like everyday..
If they are contradicting your judgement, all you need to do is make another best friend privately, and slowly fade from one to the other. And, if the BFF changes back, you now have a trio of them.