Porn...

So, long story short, my SO & I had a talk about him constantly going on his phone and watching porn. I explained to him how it made me feel, and he promised me he wouldn't do it anymore cause "all he wants is me" Well, this morning, while he was in the shower, his alarm on his phone was going off, so I turned it off. It has been a couple months since we had this talk, so I figured I'd look and see what was in his history-- atleast half of it was porn!! Idk what to do... He knows how I feel about it, and now he has broke his promise to me. 😕 Idk what it's going to take for him to realize I'm not going to put up with it.. I don't want to leave him, I love him with all my heart! We have been together for 4 years, have a daughter and bought our first home together. Any advice would be greatly appreciated..