I'm so torn on what to do

***Long post alert*** I'm so torn on what to do. A few days ago I found some questionable search history in my husband's phone. I wasn't snooping, I swear. We were at a baseball game he plays in for his work and my battery was dying and I wanted to go on the internet (I'm not a huge baseball fan, but I go to support him). It had porn sites visited every day. It had a 'local sex' website he swears was a pop up from the porn website he was on. I then began actual snooping and found out he was on Whisper pretending to be a lesbian to get pictures of other girls. There is probably more I don't know but he swears he has never touched another woman or sent a picture of himself.

So here is my dilemma. I am 13 weeks pregnant. I left for a few days to try and get it through his head, I am serious about this. My biggest issue is not in a confrontational way, a few nights before this I explained why porn and the like makes me uncomfortable. (I'm rapidly changing and don't feel comfortable, porn makes you less sensitive to sex which is a big problem for him, it is an addiction etc)

So now I am torn. I don't trust him anymore because he liked about all this stuff, even when confronted to tell me.the truth. I want our marriage to work out, I don't want the last 3 years of marriage to be wasted and I don't want my daughter growing up without a father. I also don't want him to be a bad example either.

My questions are what would you do and does anyone have experience working through a problem like this?