Sex life and Marriage

Am due to get married to my fiance of ten years this July. I'm a bit worried about us recently.. As our sex life is becoming almost non exist.. He will still hug and kiss me but he hasn't done any thing very physical in past two months.. It makes me feel so self concenious and as If there is something wrong with me. He doesn't have any interest or drive in it and if I somehow over come my insecuritys for a night he says he is too tired. What should I do? We due to get married in three months and I just want to feel loved again. :'(