How do i handle a situation were my boyfriend has a porn addiction?

When we first got together i didn't know this about him. not until i was in the middle of my first pregnancy. i wasn't even looking for it. i took a picture on his phone of us and he went back to show me through the pics we took and there were videos and pics of porn. that got me so enraged that we just starting arguing. it sickened me to know that the guy who i looks up so much to would have this sort of stuff. well he promised to delete the stuff and never have it again. Around the time i was about to have the baby we stopped having sex, do to doctors orders. and i just took his word of not looking at porn anymore...well it wasn't till after my son was born that i caught him jacking off while having his phone near by. i asked nicely if he had porn on his phone again and he said no. so the next morning i looked through his phone and there was like about 5 videos and pics of this crud...i got mad again but it just seems to me that getting mad didn't help any. and i caught him more times after that. it got to the point to where he knew he was hurting my feeling by looking at this stuff and he would just say i don't care to me that he is hurting me....what should i do?