Feel like I'm not enough..

For the past 8 months my boyfriend just never wants to have sex. We have sex like 1-3 times a month. And I'm always initiating it, he has only a handful of times. I just don't understand why. He's only 25, I know he's not cheating on me. We have a really good relationship besides that. But it's really hurting me. I just feel like he's not attracted to me, or something. And I wouldn't ever cheat on him, but it's hard not to accept the attention I'm getting from other guys. I just miss so much that spark and passion you get like being in a new relationship. I really do love my boyfriend so much and want to be with him, but this is just killing me inside to. He wants to start ttc when I'm off af but it's hard like you won't even have sex with me now are you even going then, and then if I do get pregnant I don't want to be huge, stretched out, during and after and him not want to have sex with me even less. (No I'm not bashing being pregnant, I'd die to be pregnant right now, my kids would be worth it. I just know I'll just feel more insecure with my body). I just don't know what to do. If I try talking about it he just ignores it. It's like talking to wall or he just makes up excuses. I just don't know what to do. I don't want to leave because I love him and again we have a really good relationship. I just feel I'm more in love than he is, and want him more Han he wants me sometimes.