My boyfriend wants more sex?

me and my boyfriend have been dating for 2 years. (were 16 and 17 years old) today he accused me of cheating because I didnt want to fool around. i admit I really dont get turned on. im just not interested in sex. he said im not attracted to him and he got really angry. I told him I like that we have a loving relationship and that we get along so well and have so much fun together. hes constantly groping me and i tell him to stop because I dont want my mom walking in on us!!! and actually i DO do things for him. he likes my butt and he wants to 'do stuff' down there. I close my eyes and let him do it for about 1 minute. i do it because he asks me and will bother me non stop. I dont understand how he can accuse me when I put up with his disgusting ****!! he makes me feel like a cheap skank and as much as it hurts im ready to gtfo! can someone explain why to him sex is more important than the actual love?