I feel so BETRAYED

So just yesterday I saw on my man’s phone that he’s been watching porn on Facebook and I feel really hurt by it. He knows I don’t like it and I’ve expressed it to him. He said he would feel hurt if I did that to him so to see this I feel betrayed and like I’m not good enough. Once I saw it on his search history on Facebook he denies ever looking it up but I’m not stupid, I know he did. He admits to looking at the other searches that are not sexual but denies the sexual ones. I know I shouldn’t have gone through his phone but I had a feeling he wasn’t being completely honest with me. I don’t see why he can’t admit the truth when it’s right there clear as day. He tells a lot of little lies and I hate it. I haven’t slept over this and I told his sister about it so he’s over at their house for the night. I try sitting down and talking to him about what we can do to fix it but all he does is deny. He doesn’t know how to speak when it comes to serious topics and will just repeat the same thing over and over and that hurts me too. I know this post is all over the place and I might be over exaggerating but I had an ex who lied, caught him doing stuff on his phone and cheated on me with prositutes so this triggers me and he knows this as well. I feel lost and like I want to leave him but I do love him. I’m so confused. How can we come back from this? Idk if I can trust him not to do it and it makes me look at him definitely