Confused

My husband sex drive has went down to maybe once a month I'm starting to feel depressed but he says it's nothing .... I'm starting to feel useless like now that we married he's become uninterested we have been together for 5 years married for 1 and a half and for 6 months it's been really lonely to say ....  I need help is it me ? Should I try to re talk to him ? Idk what to do ?