Forgive him?

So I caught my husband in the shower masturbating to some porn.. he KNOWS I do not want him watching porn we have had this discussion many times.. that is not something I want in my relationship.. anyway after that I was so furious that he was hiding that from me still that I went to see what else he was hiding and I find out that he has ALOT of dating app accounts and he was on there talking to women about meeting up.. telling them they are cute and talking about the features he loves about them meanwhile I just had a baby September 7th and I feel like shit... I found a message in his phone this morning from someone saying good morning and I messaged her and asked who she was and if they met and if they had sex.. she told me they met once and she didn’t know he had a wife.. so I show him all my proof and he starts crying saying he’s sorry and he was dumb.. well at first he denied it before the proof.. but anyways he said he never planned to have sex with anyone.. blah blah deleted all his accounts unlocked his phone and told me to go through it whenever I want.. but the question is how tf can I forgive him? How can I move on from this?