Why is it so hard to resist his offering of sex?

Okay I am a sixteen year old girl and I cherish being a virgin almost more than anything. At my school there is a lot of girls who put out very easily, but I'm the type of girl who respects myself and has morals. So this boy in my history class have been talking, making fun of each other, and just being friends. But then like a few days before the last day of school he asks me about my sex life. I simply told him that I don't do those type of things and my Main priority is school. But then he cracked open my soft spot about me and my last fling and how he totally hurt me. He said that when he realized my hurt he knew that I deserved to be loved and be pleasured. Then after that he just straight up asked me if I wanted to have sex with him. First I thought that that was a bizarre question and my answer was no! But then we started talking more and he's been bringing up sex more and more. I know that it's wrong to put out for this guy but it's getting more tempting each day an I dot know how much longer I can control myself. I have no feelings for him whatsoever too. So in all honesty what should I do?