I am defeated

So it all staryed because my one friend was upset because we had a conversation and did not include her because she didn't know what we were talking about. She got mad and I usually let everyone walk all over me so I finally told her to stop being a hypocrite because she has conversations and excludes me all the time. My boyfriend backed me up and so did one of our oher friends. My boyfriend is her boyfriend's best friend, and she hates my boyfriend. She is manipulative and will do anything in her power to destroy their friendship. Her boyfriend refuses to talk to mine now because she said he did everything, even though I am to blame. Nobody wants to talk about what happened to clear up the situation and I am defeated.  I had depression in the past and it is slowly swallowing me whole again. My anxiety is through the roof and I feel so useless. I have no friends because all of our friend group is ignoring my boyfriend and I under her command. It is all so stupid and I van not do anything about it. I feel like I am going insane and I feel like crying 24/7. The only personI have is my boyfriend and I love him, but it hurts losing my friends out of my control.