Not inlove anymore?

I’ve been with my boyfriend for 3 years on and off. When we didn’t live together i remember being so in love with this kid. I got butterfly’s when i got a text or call from him. I’d re read our texts, I’d get so horny just kissing him. He could do no wrong to me back then. I just thought he was the cutest thing. Now it’s like i don’t even like kissing him. Idk if there’s just too much hurt from past issues that I’m just still not over or if the chase is over and i just truly never was in love and it was the excitement i loved?? I’m not too sure.. I’ve only been living with him for a few months now & we also have a newborn. Everyone keeps saying it’s just cause i had a baby but I’ve been feeling like this for some time now.. i just don’t like him anymore. All we do is argue too now which kills any type of love i did have left for him.. idk. I miss loving him. I miss being excited and getting butterfly’s and making myself look cute for him. Now i can look like shit and just not care I’m like over it.. any tips or idea what’s going on??