He's making me feel bad

So I'm 7wks pp.. and I've had no sex drive at all. I spend all day at home with baby and even at night I do most of the caring for my son. My bf probably only changes him couple times... I literally do it ALL. Anyways , I'm just saying I'm tired!!! Stressed!!! And the last thing on my mind is sex 
My bf just said to me earlier "I'm not gonna be with you if I have to beg you to have sex with me" he literally Makes me feel so bad that I don't wanna do it. I have no interest to ... plus all we do is fight. I don't even care anymore if we last or not..... I hate to say it :( anyways what do I do??