Furious 😢

So I noticed a few days ago my fiance jumps when his phone goes off and has to reply right away. I thought maybe it was his mother or other siblings so I didn't look through the messages. Last night while watching our 4 month old the phone goes off and he puts her to one side and is typing for a very long time, so I'm curious. I go through his phone and I find messages from him telling other girls he likes their breasts and how he wishes they would marry him. I also found one from him telling his friend, who is a girl, how he wants her "kitty". I just about exploded but I kept my cool. I've been crying for the last 5 hours because I don't know what to do.. when I look at him now I feel disgusted and disrespected because I just had a baby and yeah I may not look the way I used to but jeez it hurts knowing he's doing this. 😢😞😦😭