don't think my boyfriend finds me atractive anymore

so me and my boyfriend have been

together a year and a half almost we live together and he doesn't look at me the same and he hardly ever wants to have sex. and I confronted him about it

and he said he likes it when I start first like sucking his dick or feeling on him and get him hard but I do that and tonight I tried to do that I wanted sum b4 I started my period on Friday but he went to bed . And I know hes not cheating on me because we go everywhere together and he works from home so I know 100% sure he's not cheating on me and I've gained a few pounds since we got together and so has he but I still think he's fine and Idk what to do it hurts my feelings and I cry for no reason cuz I think he's not attracted to me anymore just don't know what to do anymore im not the prettiest girl around but I don't think I'm ugly not sure how to tell him how I feel