I slept with my bestfriend’s boyfriend and now she hates me

Ok, hear me out Reddit because this is long and is as bad as the title sounds. When I was 15 I met a guy and we hit it off real quick, we were very good friends and used to make our sometimes. I was very much in love with him but never told anyone anything, then wen I was 16 he started dating my best friend, she’s the most beautiful person ever. About a year later they were still together in the most toxic relationship and we were just graduating school. She left to live in another country for sometime and while she was there (they were on and off for those 6 months) I slept with him (instantly regret it). I told some of my friends but of course I wasn’t proud of it, I kept it a secret. It was bad because after that I used to comfort him when he did bad things and I felt like a traitorous (and I was), I just was to afraid to say anything and hurt her.

Now, in 2021, about 2 and a half years after everything happened (we were 19 going 20) I had a disagreement with one friend about a misunderstanding and she told everything to my best friend out of spite. My best friend told me a week later that she found out about everything, she was heartbroken but she behaved like a queen. I wanted to die. She spoke to her boyfriend that day as well and apparently ended things with him.

After sometime they come back together for a while but didn’t last that much. After that, my best friend and I talked sporadically and in our birthdays but nothing much. I was fine with it, I grow a lot in this years and of course absolutely regret hurting her but I forgave myself and was perfectly happy with my life. Now I found out that in the last 6 months she started hating me very much and I think is specially because she was expecting that our mutual friends turn their back to me and be in her side but non of them did, no one made me feel bad even though I probably deserved it. It makes me sad that she’s been dealing with this hatred and resentment this last 2 years and her support group is not that great.

I never had the opportunity to speak to her, perhaps I never tried that hard thinking that giving her space was the best move, probably not. I don’t want to try to justify me, I just want to say to her that that’s the worst thing I’ve done and I completely regret ever hurting her. I am happy now, more than ever before and I just want her to be like that too.

Now, my question is: ¿should I talk to her? Or just leave things as they are.