Need help :(

I’ve been with my partner for 10 years, and we have two kids together. I’m ready for baby #3 and he keeps saying he’s not ready yet, and I need to wait until our second turns 5. I’ve stressed to him NUMEROUS times the reasons as to why I’m ready to do this now, even mentioned during sex. I’m so ready to have another that him saying no secretly makes me depressed. It’s to the point that I don’t enjoy sex with him anymore. Im extremely depressed when he pulls out. I’m ready to just not have sex with him any more because of the way I feel. Is this even normal?