Is it really my fault?

I was at my friend Tristan's house and I was talking to my x girlfriend dakota on the phone, and she was begging me to sneak out and go to her house at like 2am so i did. I get there and me and her do some stuff that I am not going to say. After I got back to my friends house I told him what happened and I told him not to tell anyone so guess what he does. he tells everyone! A few days go by and and HE asks me if i was mad at him and i told him i was because he told everyone what happened. then he flips out on me and says none of this would happen if you didn't go there in the first place and says its all my fault, but this never would have happened if he didn't tell anyone. my X hates me now too because she thinks i was the one who told everyone.