my sex life sucks

So my SO and I have been together for a while now. At the beginning of our relationship our sex life was amazing. Now it’s like once a week we have sex and it’s making me rather frustrated. We both want a baby eventually but we want it to be one of those “when it happens it happens” type thing.. therefore we have not been preventing it at all. We haven’t been using protection I’m not on birth control of any form and he hasn’t been pulling out. Unfortunately I have not gotten pregnant in the 6 or 7 months we have been having sex with no precautions. Well when we decided to no longer attempt to prevent having a baby the first time we had sex after that decision, obviously he did not “pull out” and finished inside of me. After we had sex he strangely sat me down and told me “I only have came in girls that I love, bc I’m not afraid to have a child with them”. Then told me that his ex and I are the only two girls he has not taken precautions with. Well lately he hasn’t been wanting to have sex with me except once or twice a week like I said earlier in the post. That being said, he’s been oddly pulling out. The way my insecure mind thinks, is he doesn’t love me or he’s not attracted to me. Has anyone experienced this or have any ideas why he has been so sexually distant or all the sudden pulling out?