I don't think my husband is attracted to me..

My husband and I have been married for a year and half over this time we both gained about 40 lbs.. when we first got married he always wanted to have sex but I was a virgin when we married so a lot of times it hurt after about 3 months the pain stopped but he slowly has stopped having sex with me some months we only have sex once.. is this normal or does he just not find me sexually attractive anymore??