What should do about this straight guy?

Hes in my chem class and we have the same bio prof but at diff times. We atudy together and lately been spending even more time together studying. Everytime we get toegther its a lot of flirting on both sides,we can barely study bcus we flirt so much.the thing is he very adament about that fact hes straight. And he check out girls and talks a lt about girls. He tells me he would never be gay and he doesnt understand how people dont like vagina etc. But anyways iv been feeling like hes been using his good looks and flirting ways for me to help him get good grades. And i dont appreciate this. I confronted him about this and he tells me that he likes my friendship and spending time with me and he flirts with me to takr advantage if the fact that im gay,that he is in no way gay and hed rather put his dick in a grinder before liking another guy. Needless to say that was the end of our conversation i see him tomorrow and i dont know wht to say to him. Im hurt by tbe things he said. I dont have any feelings for him we just flirted which is fine,but i did enjoy his company and im just hurt that he was trying to take advantage of the fact that im gay. He doesnt think its a big deal but i do. What should i do??? A