Need to vent...

So my husband and I have been together for about 7yrs now, we have no children and have been married for about 7mo. Before we got married last year (about a month before), I found some messages on social media and he was having an affair with one of our old coworkers (yes , at one point we both worked at the same office and she would compliment us) it happened back in January of 2018 thru about middle of February 2018. I didn’t find these messages until May 2018. He would basically invite her over while I was at work , he would compliment her , etc. During the beginning of that year I was going through a lot mentally so I do admit I pushed him away a bit but that still doesn’t make what he did right. I remember just handing him the phone with the messages wide open and he didn’t even know what to say. No I didn’t go off on a cursing and throwing spree I simply asked him why. He told me it was because he felt alone but he swore nothing physical ever happened between them. He had quit the job around the same time he stopped communicating with her. He was deeply embarrassed and apologized profusely. I willingly decided to forgive him and continue on with the wedding. Things have been great since then until recently I noticed he had changed his cell phone password. It was just a red flag to me. Mind you I never look through his phone, but something told me today when he handed it to me unlocked to order some food to look through his social media, so I did. He had been commenting on an old high school friends pictures with her son saying stuff like “So cute” and she was telling him she wanted to get lipo and his response was that she was gorgeous already. When she asked how I was doing he said and I quote “she’s a pain but she’s good”. The rest of the conversation was just about Netflix and him “loving to work” which is complete bs because he complains about his job to me all the time. At one point he was out of work for 4mo and I was the sole provider in the household. But the most recent ones are of her sending him pictures of different tattoos on her body. I took a video of some of the conversation and I’m keeping it in my records in case I ever have to use it. I gave him his phone back and I don’t think he suspects I looked through it but now I’m just wondering what I should do. I’m completely lost and I’m feeling extremely numb to it all. I leave on a trip with some friends in a few weeks and I’m honestly scared to leave him on his own seeing what I just saw. I told him I didn’t want kids right now and he had a conversation with her about that and how even if he has to adopt that’s what he’ll do on his own if he has too. About two months back his camera roll was filled with naked women off porn sites and his explanation to me was that he’s had an issue with masturbation since he was 13. We have sex about once a month and that’s only because I’m not always in the mood , my job is extremely draining and I literally have had no drive since the first time I found out he was speaking to someone else. I don’t know what to do at this point. This man treats me very well, he gives me all my wants and needs and never forces me to do anything I don’t want to do.. it’s just so amazing to me how someone can love you so whole heartedly and still be doing stuff like that behind your back. This sucks.