Not in love with him anymore!

I’m just super confused on my life I got a divorce years ago and now my fiancé and I are engaged. When we first got together it was amazing he was amazing. We didn’t lack major intimacy. Now he will hardly have sex with me and all I feel is rejected, rebellious, and sad over it all. I’m starting to think I don’t love him anymore because I’m literally constantly just angry and griping at him. He’s always asking what’s wrong and I tell him and nothing ever changes. I feel stuck I have two kids by two different dads. I feel angry at him for getting me pregnant but then just stopping all intimacy it sucks. I feel afraid of losing him in a lot of ways but not sure it’s love. Like is it possible just to stop all love for someone? Just no spark at all and I’m over it. Sex is important to be close to each other and I just hate this…