Post partum sex

I’m so frustrated me and my boyfriend had sex when I was 4 weeks post partum it didn’t hurt and I’m fully healed, well I wanted in 2 days ago and he said no “ we need to wait so we don’t have another baby” we used protection and pull out method why is it now that I want it I have to wait.. I’m literally so sexually frustrated I don’t even want to be with him tbh it’s causing so many arguments, and I just don’t feel like we are close like we used to be