Broken promises

My fiancé came home last night and sat with me in the couch. I asked if I could use his phone to look up this video I wanted to watch. (My internet is out for the month) he let me. So I went to Facebook where the video was and went to search my name. Well before I typed anything there was this girl. I clicked on her. Turned out she is a porn star. I asked him about it and he told me some lie. (He sucks at lying. ) I didn't say anything about it but I was feeling really hurt. ( A couple months ago he majorly lied about watching two videos (porn) and then I found out it was over 100. He even swore on my and out babies life..I wasn't pregnant then) anyways I ended up going to lay down and calm down. I got up to go talk to him and he said he found a link to her Facebook page from a friends page and clicked on it. I asked him to show me. He "tried". But " couldn't find it."  He accidentally clicked on his browser history and after I went to lie down he looked up more porn sites. I asked him about it. But ended up just going to a different room because I could tell he was lying straight to my face. I told him I don't want to be around that and I don't want my kids around that. I don't have a clue what to do and I feel completely alone and he won't even talk about it.