Finding comfort

I love my boyfriend dearly but I am just so uncomfortable now at 32W I don't want to be touched at night! He doesn't understand why j am pushing off his extremely heavy arm from my side. I try to explain the extra pressure he is adding onto my back but he just gets upset. I try to sneak and go sleep on the couch Bc it's the only place I'm comfortable and he gets upset about that! Balancing pregnancy, being an active mother to a six year old, and doing all the chores around the house with no help from him is hard enough ( I mean cooking meals doing all the laundry dishes and packing his work lunch all by myself everyday) how can I get him to understand I need his support and help right now not to be stressed out and feel guilty for being uncomfortable.