In need of a little help

I was just seeing if I could get some help from some people out of the equation. This is a long post so if you do make it throght it please leave a comment. So recently my best friend messaged me asking if I saw this post on fb that my boyfriend of 2 year made a comment on. I said no. Well I went looking for it and I found that he made a comment on one of his ex's post. Her post said now accepting applications must be faithful. His comment was Can I apply I know I live far away but still. This made me really question our relationship. So I did the juvenile thing and went through his phone and found on fb messenger text that they had both been sending to each other. let me just tell you they were not bad but bad enough. that someone who is in a relationship with shouldn't be sending not dick a v pic.So I take pic of the text just for proof . So me being who i am I made a comment on his comment saying wow!! I guess I don't mean shit to you. So of course I went snooping a little more on her page and found a lot more. So it's the middle of the night and I'm just boiling at this post no sleep at all. So morning rolls around and he's off to work. I'm guessing he didn't see my comment intill this chick wrote back saying all he does is talk about you. I know he loves you very much. And again me being who i am. I said really cuz it doesn't seem that way through all the text you two have been send to each other. Right after that he calls me saying what the hell is that all about so I told him I went through his phone and found all those messages. he tried telling me that they where all old and not recent. I said that's a lie cuz you told here that you just got back from Cali which was right after Irma. And told her that she needs to get her ass down here and that he has a very bad toung and fingers. oh and while I was at work she asked him what he was doing and he said waiting for his women to get home and she said I wish I was coming home to you instead of her and he said I know right. he got pissed off and hung up on me . So that whole day we were going back and forth on fb putting each other down. which i know is not right. putting all of our business out there and I got just what you would expect. all of his friends saying he's a good guy either accept it or leave he has such a big heart. blah blah blah. So he made another post half apologizing and the other half still putting me down. So I went ahead and said so this is okay for someone who is in a relationship to be saying to another women and posted the 8 pic of his convo with her. and that's when people started to change there story. agreeing with me and not with him. And he started getting even more pissed off. Anyways so we really didn't talk much in person about it till later that night and I still got the same excuse that it was a long time ago. Whatever . So the next morning he's leaving for work again and he moves people so this time he was going to be gone for over night and be back the next day. So he starts texting me saying that he's sorry blah blah blah and I told him that sorry isn't going to help right now. that he really hurt me and that my trust isn't there for him right now. he says he know and that we will work on things. Well he's back now and it seems like nothing ever happened. like everything is going back to normal. i dont really know that im truly over it i guess not cuz im asking you guys for some help. but i dont know to bring it up again. i guess i want to hear why was he texting her or something. like is it me am i doing something not doing something or does he truly not want to be with me anymore. if you have anything helpfull please leave a comment for me. thanks for taking your time to read.