I feel like my fiancé isn’t sexually and/or physically attracted to me anymore ....

I’ve been with my fiancé for a little over 2 years now. It’s been at least a month since we’ve done anything sexual, and a girls got needs you know... I try to mention it to him but it’s like he doesn’t care. He ONLY has sex when HE feels like it. But when I want to do something he’s not into it . He doesn’t make me feel beautiful. I feel like I’m just a fat and ugly person he’s stuck with basically. I just had our baby in January of 2121, and I just feel so not loved. I really and truly believe he’s not into me anymore. Since our baby was born we’ve had sex MAYBE 5-6 times. He looks at other females in public the way I’d loved to be looked at. I’m such a jealous person, if he just so talks to another female, I’m jealous. And also when he looks at other females I get jealous then too. I can’t help it. I’ve tried letting things go and just accept I’m not the person he truly loves and that he just doesn’t find me attractive enough to be loved. Can someone please give me any kind of advice to help me ....