“I’m to tired.”

I have been with my fiancé for four years. We have a toddler, so sometimes having sex can be difficult ( I get this). However, almost every time I try to initiate any kind of sexual conduct he says “I’m tired or stressed.” I have talked to him about this after we had our baby my self esteem went down the drain. I gained 27 pounds and lost 4. (Still trying to loose). Mind you, our toddler is two. Anyway, while I was pregnant he was talking to other women, was not happy, but he would hardly ever have sex with me. And now I have noticed that having sex has become a chore. We only have sex when it is convent for him, even if I’m exhausted ( I am a night shift nurse and primary care taker of our child I never sleep). IF we have sex the lights are off and it is always late at night. I’ve let him know how it makes me feel, tried using different props (he just shrugs and says oh that’s sexy then goes on about his day) I’ve tried dirty talking, everything! Tonight i said obviously there is a bigger picture and you won’t tell me his response, no we need to go to sleep.

I am at a lost. I don’t know what else to do. I know relationships don’t run straight on sex but this is getting ridiculous. Please help!!!