Sex problems

Both my partner and I are and have been trying to get pregnant for 3 years but...

he has problems with depression and has low self esteem about his weight when we first got together he has no problem having sex with me but for about a year now I can count on one hand how many times it’s been. I try to talk to him tell him I have needs but it’s not helping. Any advice would help please if someone has gone through this HELP ME!!!!!! How can I get pregnant with little to no sex? Thanks All🙂