Women.....how would u feel about this guy?

We've known each other 4 years, been together 2. It's always been long distance until 3 wkd ago he moved down here to be with me and his son. We have a 3 month old together. I went to his apartment 5 nites ago unexpectedly and caught him watching porn online. To me that is a form of cheating so I made a big deal but I was willing to let it go and start over. Since he's been here, he always goes to my wrk to eat lunch. We have a new girl working there and the past couple of days, I've noticed him constantly looking her way. I'm angry at him for it but instead of saying anything I'm just ignoring him. He is blowing up my phone with calls and txts but I feel like a fool. He cried alot when I caught him watching porn and swore that's all he does is watch it but swears he would never cheat on me and left his family, job and everything for me so that should prove he is sincere. It just makes me think of him as a big cheater since I've caught him looking at my coworker....what would u think?