Help!

My husband and I had always said we would have 3 children, even prior to marriage. We have 2 daughters now (7 and 5) and I have been ready for our 3rd baby for years now. My husband now says he doesn’t want any more children and has even limited sex with me because he doesn’t want me to get pregnant. He made a comment today about me “getting over it” if I want to feel “desired.” I guess I just don’t know what to do. Has anyone else been through this? The thought of not having a last baby literally makes me depressed and I feel lost. TIA!