My boyfriend no longer has sex with me. Im 18 and he's 20 and we been together for 2years. When we met he wanted sex ALL the time, EVERY DAY! I was not a sex person. (was still a virgin) and now I'm a sex freak thanks to him. And now we live together and he's like not asking for sex like he used to... Im the one asking for it now. He also gets mad when I keep asking for it. Can he be cheating on me? Help me please. We both young and I do not want to lose him.