I don’t know what to about my bf

I (18F almost 19) have been with my boyfriend (19M) for about a year. We have been engaged for two months,and he has a two year old that I am heavily involved with. The other day I saw him being very protective of his phone. Which is not normal for him. The next night I woke up and checked his phone and saw he was texting over girls. The texts were very graphic with pictures of said girls. I woke him up and confronted him and he was crying and telling me that I didn’t deserve this. We talked it out but I am still thinking about and a little upset with the situation but I don’t know what to do. P.S he know that my last relationship ended because of cheating. Also we work together and we co own a car