I need help.

I am an 17 year old boy, who recently got in college. I don't have many friends and I don't speak that much. Recently I have found my friends don't respect me and act kind towards me in person and back talk me, the previous friend of mine who was a bully and made those friends who I had at that point stay away from me, only few of my true friends stayed with me, I cut others off after telling them how hurt I was. The bully came back saying sorry and apologizing I didn't forgive him as he has done this 2 times already in the past and I had forgiven him. One of my closet and longest friend is also, hos friend and whenever my friend tried to stay away the bully uses reverse psychology and makes him stay while, making me seem like the one with mental issues. I recently found out on discord after my that friend added me there that, the people who I cut off and the bully talked shit about me every other day, those who I didn't know did as well and they were in the same college as me. I am in college those friends and bullies went away after high school so, I thought I was free. The thing is I don't care whatever they do, they don't get under my skin, but it's my friend whose mind they are polluting and he's slowly turning like them, and doesn't realize it. I talked about my friend staying away from me right? The bully and that friend were responsible for it, and the friend doesn't think he did something wrong. I wanna desert him let him die and do whatever he wants but, I can't when I try to explain what he did he says don't take it seriously. There is another person in that discord group, who is in my college and talks shit about me there currently finding out who he is and going to councilor with what I know. Apart from that, I need a solution to stay away from my friend and gain my respect back and get rid of those who talk bad about me. I play the victim because I am the victim here of cyber bullying and irl bullying too, I don't talk much or do things that doesn't mean I don't have feelings and it can't hurt me. I tried talking to my friend he doesn't realize it and I'm afraid he would spread some bad rumour about me.