Bf watching porn bc of sexual incontinence

Okay- so let me start by saying that I love my boyfriend more than anything and I know he loves me just the same. For the most part our relationship is solid. We hiccup every once in awhile but that's normal in any relationship. Our sex life is VERY active. We have sex at least once a day, and I know I satisfy him. We've been together a little over a year and after the first week or so he talked me about this "problem he has". Sometimes it just doesn't work on it's own. We've tried a lot and ended up seeing his doctor for it and got prescribed something to help and it totally does. He just really beats himself up about it and thus far, nothing I can do or say reassures him. I've always been very honest with him and in the beginning it was hard sometimes to deal with and I would tell him and we would talk about it. It made me feel like I was doing something wrong. But we're way past that now and I totally realized its not me. He's obsessed with my body and the way I do the things I do to him so I'm not worried about that either. Yesterday I found out he watched porn. We just found out that I'm pregnant- a little over a month along. The porn thing goes back awhile and I found out he did it before and I told him how much I hated it and how it makes me feel bad about myself to know he's watching other girls besides me. I don't do that and I don't want him fantacising about someone else while he's inside of me- sorry. But really it's a mixture of all that and the fact that I've been cheated on so many times when I was younger and it scares the **** out of me. Anyway- yesterday When I found out at first he told me he didn't know what I was talking about. Then after much silence and me losing my mind because to me nothing is worse than a liar - he came clean and told me that a couple months ago he saw on some sex therapy article or the like that sometimes people watch porn while in the act to amp blood flow down there so it works better. He said he tried it once a few months ago and said it didn't do anything. Well we ran out of pills last week and he can't get a refill until the end of dec. usually he would just get some from a liquor store by us, and he wanted to go this weekend but I've been feeling sick because of the pregnancy and I didn't want him to go alone because I wanted to be with him and it's kind of a long way, to walk at least. So being the sweet man he is, he didn't go. But then on Monday and Tuesday he watched porn at work on his phone. At this point it's past the fact that I don't like porn, but that I feel my trust was betrayed. Yesterday once I finally got him talking, I told him its either me or the porn and that I thought he should choose me. He laughed because I was trying to lighten things up after us both getting emotional about it and he said "Of course I choose you". Well now it's been screwing with my head and I'm scared he'll end up doing it again and we'll go back to where we were and it'll jut keep hurting me more and more every time. I feel like maybe I should tell him i want to be okay with it. I want him to be open and honest but i know he wont tell me because he knows it'l hurt me. What do I do?