Needing advice

Okay so I will be 18 weeks pregnant tomorrow. My SO prefers watching porn over having sex with me. Yes, I understand he is like his dad and doesn't want just sex out of a relationship. At my first ob appointment (10 weeks) I got checked by my doctor the way they always check you for something you shouldn't have. Come to find out he gave me chlamydia.. I know this is kind of personal or whatever, but he doesn't care if he goes and gets checked to get clean. I told him he needed to go do it and he told me he just doesn't care.. He did however tell me the other night because we slept on seperate sides of the room for 4-5 nights instead of our bed he said "I don't want to fuck you well I do, but I don't want you to end up getting this again knowing you already took your medication for it" At least he's trying to look out, but still. I guess what I'm trying to ask is. Why would he not want to go get checked? I already took my medication like I was suppose too. Does he just not like having sex with me anymore or what is it? It hurts me knowing he can get off in the shower by watching vidoes of girls in a changing room, but not want to go get checked. Granted our sex life is great. Well, was at one point in time. I don't even know what to say to him to try and even talk to him about this.. I'm just lost for words. Someone please give me advice???