Low sex drive

I had a baby 9 weeks ago and ever since I have no sex drive.. None at all. We used to have sex every week to two weeks and now it’s almost none. My boyfriend said that it bothers him and he wants to look for someone else because of it :( idk why I don’t have a sex drive. I just don’t want to do anything sexual anymore. When we did have sex I had this terrible feeling like it was wrong and that we should stop; I also felt so ugly the whole entire time because of my postpartum body.. I feel so alone because our relationship has really tanked since I gave birth we don’t spend any time together or do anything sexual... no even kiss or hold hands. I just feel so sleep deprived and tired and stressed out nonstop. :( any advice?