Am i in the wrong

My fiance is mad bc i feel im not ready to have sex yesterday i felt good enough to do so and he turned me down saying hes now mentally and emotional screwed up due to me makeing him wait almost 5 months my son was born Dec. 27 2019 we hav had sex 3 times since ive explained that im very tired and i don't feel good about myself I definetly dont feel sexy he's telling me he doesnt feel good about himself anymore due to lack of intamicy so we are at an impasse i don't kno what to do i feel like he doesn't understand and he hasn't done anything to help me want to to make me feel better i tried explaining to him me fears and feelings he says its just an excuse that i just don't want to we need help please