How do you deal with hubby wanting intimacy when your don't?

Ever since I gave birth, am not really interested in sex. I have had days when I thought and dreamt about it but I just don't feel like sex. I want to think finding out he had restarted to secretly talk to the girl he once emotionally cheated on me with after we had agreed it is best he breaks contact for us to build back our trust -when I was in labour on the day I gave birth to our son- has nothing thing to do with my lack of interest to be intimate with him. I really want to think it is hormonal and me scared of sex after birth but it ain't true. He told me he just talked to her. N never cheated n am mean to treat him like he cheated. He told me he did STH I don't like, now it is my choice to choose what to do with it n he can bear the consequences. No apologies. N he keeps telling me how he wants to be intimate. I had never rejected my husband before but he spoilt things for me. I really have this negative view of sex with him. Also because he doesn't understand how I can not want it. Or how I can not be turned on. That it is my brain. Anyway. We still married n I don't know what to do to get back our intimacy which used to be beautiful.