Am I a cheater?

I've been best friends with this guy for a year now and he knows I have issues with friendships and promised we would stay friends and he would make sure of it.

Then he started going out with this girl (I told him to ask her out) and she hates me!

She went on holidays and cheated on him, and at a party in his house she kissed his best friend. But they are all friends again two days later.

Then the week after we went to another party and my hand was on my knee and he held it. He told his girlfriend which I completely understand but now he's not talking to me because she won't let him. We hang out in the same group so I cant avoid her but she's told some of my friends not to talk to me because I'm a *****. Am I in the wrong? I used to have a crush on him but I knew he liked her and supported him when he wasn't sure to ask her out or not. What do I do I can't text him or talk to him cause she will hate me more?