She did leave me and blocked me from everything, I tried to contact her to at least know why, but she refused to say a single word

Now after almost a month she came back, but she's in a relationship with my closest friend
Idk what to feel or what to say, idk how can I take it
First my "friend" who didn't even tell me about it and even tho I was chatting with him EVERYDAY, or the fact that I have 0 chance to be with my fp again

And now my fp still wants to be friends, and my "friend" made an excuse that he "didn't tell me cuz he didn't want to hurt me"

I tried to cut them off both, but they really insist to remain friends
And the biggest problem is that I'm lonely af without them so idk what should I do..