what can I do? 😔

So my fiancée and I are going through a rough patch in our relationship. Constant fighting, he disrespects me so much and then we both say things we don't mean when we're in a heated argument. He doesn't appreciate anything I do (stay at home mom with our son, do EVERYTHING in our home clean, laundry, cook etc, and go to college full time), lately he's been really distant and in general doesn't want to spend time with me. He also started to drink. I know for a fact he's not cheating. But I think all of the fighting has made him lose feelings and fall out of love with me(even though I never start the fights, they're mostly his fault), and I don't know what to do. What can I do to make him fall in love with me again? Is that even possible? I don't want to leave, I wanna be with him and give our son the family he deserves. We do go to couples therapy but we haven't gone In a month. Any advice on what I should do? I also have postpartum depression and this all is just really getting to me😔😢