I feel extreme bitterness towards an individual and a group.

I tried to call out bad behavior within the group and one day some of them gossiped behind my back. They said I was sensitive and villainized me, all because I said how I felt. I confronted them, and talked it out. One a day a friend of mine saw them and asked them about me. Their reaction was cold towards me, it was awkward. One of them said, we don’t talk. That impression makes me think that I did something wrong to them. Why are they trying to play the victim now? Or maybe I’m just overthinking.
I say many times I forgive, and wish them well, but man the bitterness inside lingers overwhelming lingers inside me and I can’t get rid of that feeling. I say I forgive, but the bitterness lingers. I need help, because this feeling it just taking over me.