Need advice!!

My fiancee have high sex drive like he need ml everyday but he love me so much that he don't ask or demand me to fulfill his desire..After i back from office everyday i generally feel sleepy and he cares for me so much that he don't initiate sex.If we start ml then after 1 round i get so so sleepy and he let me sleep well.But he can't sleep or tired in 1 round as he needs more..He always says i love you more than anything but I feel selfish that i can't fulfill his high sex drive.i don't know what to do and how to satisfy his desire??