how my 7 years long friendship ended

so I was friend with this guy for 7 years since highschool we were together everyday through ups and downs. I saw him as a brother I never had although my parents keep telling me his not a good friend and i persisted on him being a good friend so after 7 years he goes into a relationship with a girl and I was so happy for him since this was his first serious relationship with someone the days go on and I noticed him being anxious and mad all the time one day he started talking about her girlfriend smoking meth and hanging out with junkies and arguing with her all the time I suggested breaking up with her but he continued his relationship they relationship was messed up breaking up and getting back together constantly I was worried about but didn't do anything other than just to talk him out of this so they break up one day I was so happy he got over her her ex kept texting me and I texted back occasionally but I told him that her ex is texting me after 3-4 months suddenly out of blue they get back together and I was so annoyed about his idiocy so I did this big mistake to take action since I couldn't talk him out of this and talk her gf out of the relationship so talked with his gf to go see her and at least talk her out of this so we arranged a meeting and I the day of meeting I was back from university and I was so tired I canceled the meeting so after a week I got into a relationship with a girl who is not addicted to drugs and when I called him to say the news he was talking so formal like he doesn't know me and when I asked what was wrong he said yeah you were trying to hit on my gf I was so shocked I just asked hey u sure? he was like yeah I saw your messages wanting to meet her you clearly wanted to hit on her I just hung up I didn't have time to prove myself especially to someone who knows me for 7 years and thinks I wanna steal her gf I just messaged him that I'm sorry he thinks this way and I be glad to explain it if he wants to hear he seen the message but never responded and we never talked after that day it's been a year I was so depressed for first but grew out of it and living a life without him not wanting to see hem again sorry if it was a long story I jast wanted to share this story anonymously since I didn't talked about this much to my friends and sorry if there are grammatically errors in here English isn't my first language hope your friendships last forever