Unresolved Issues

I don't believe one should have any regrets in life. I believe everything happens for a reason. But i can't figure out what the reason for this is.

This is something I need help to decide on.

About a week ago, an old friend of mine turned twenty and i didnt get to say Happy Birthday.
Why? because of a lot of things.
I was really pissed off at him and told him it would be better if we didnt talk anymore.
This happened awhile ago, but now its as if we never knew each other.
There was a time everyone called us best friends and his mother loved me and I thought she was awesome too.
But his now fiancée became jealous.
She was also a very close friend. Until they started "dating"
i type "dating" because their families really REALLY dont allow it. Its a religion thing. So, to not disrespect her parents or break any rules in her religion, she would come to me and talk to me about him. I wasnt very close to him then. She actually pushed me to him so she could talk to him through me.
When she noticed that we had a lot in common and that her mom called me his bff, she got mad and jealous. Also, I felt it was wrong to hide something when they were both serious about each other. I thought she should just tell them and I was trying to advise him to do the same. She was scared; he wasn't. So, she thought I wanted him all to myself.
She accused me of trying to steal him, but i knew (and he did too) that i didnt like him.

 I was actually crushing on someone at the time. I had told him about my crush too. Thats how close we were. And thats how awesome he was, because he didnt tell anyone. I think he's the only person I truly trusted as a friend.

But i hated how my friendship with him tore apart my friendship with her. And she told him that she thinks I like him or not to talk to me anymore. I'm not really sure, but she said something because he became evasive and awkward and different. I noticed and sorta called him out on it. Said I think your girlfriend is pissed off so maybe we shouldnt talk anymore. He said okay.
Just okay. Nothing else. He seemed relieved too.
He's too nice to pick one person over another. But I took out all my anger on him and i truly regret it.
He's the one that helped me write again. and writing is like breathing to me.
I stopped talking to her too. she took it as I was jealous of her and his feelings for her. I told her that shes an immature baby that needs to trust me, one of her first friends ever. But no. She stuck to him and still has the same delusions. i dont htink she'll believe me until i get married.
I dont regret yelling at her. but she regrets the way she treated me. She told me and yet she still believes I had feelings for him.
The funny thing is, when I told her I'm not attracted to her, she got defensive, asking why. And she listed everything good about him. and how we have a lot in common, like writing and such. I told her I'm not attracted to someone who is exactly like me and thats why hes a great friend and nothing more.

 I wish I could just go back. Or at least talk to him. But I'm scared he now believes I like him. It's been 4 years.
Maybe he's not even the same person. Maybe writing was just a phase. Or someone else is supposed to come along.
Besides, i dont have the guts to say anything to him even if I decide to.
I know. My life is filled with drama. what can I do?

I'm still deciding.