my bgf kissed me...

I went to my bgf house, my boyfriend had cheated on me again and I was really sad and I didn't want to be alone so I went over and we hung out and we were having fun and I was feeling better and he kissed me....
I told my bf but a few days later Bc I was scared he would leave me 
Now he won't look at me or anything but we're still "dateing" I'm thinking I should just be don't I've forgave him 6/7 times but he won't forgive me when I got kissed and didn't kiss him back... what should I do?