No more sex, please help 😭

So after I had our son, my fiancée and i's sex life is almost non existent. We used to do it every single day. Now I'm lucky if we do it 2-3 times a month. No, he's not cheating and he's not masterbating. I know that for a fact. He tells me he's lost his sex drive. Last time this happened, he had told me that we lost the spark in the bedroom. Whenever we do it now which is barely ever, we do things he wants, I do what I can to please him, and we go hard. I'll try to get him started but sometimes he doesn't get hard. He teases me which pisses me off to no extent because he doesn't do anything, for example, he will lay on top of me, start kissing my neck and making out with me, rubbing his penis on me and then stops, rolls over and goes to sleep. I can't take it anymore! It pisses me off so much because I just want that intimacy back. I'm starting to get depressed. My own fiancée doesn't want to have sex with me.. I feel so ugly and unattractive. I still have lots of weight to lose from my pregnancy, but a few pounds shouldn't stop him from wanting me. I miss the feeling of being wanted. I miss the intimacy. I miss it when I couldn't even changed my shirt because he would get so turned on he would throw me on the bed. Everything has changed now and I don't know what to do.. I've tried talking to him many times. He tells me that he's just lost his sex drive. And no, I don't want him to try viagra, and he refuses to see a doctor. I've tried wearing lingerie, sexy thongs just whatever I could to get a little more sexy for him and nothing. And when we finally have sex, he just wants a quicky. I'm so frustrated and it's really getting to me. Please give me some advice, anything.Â