Gemini male Aries Female Experience

I’ve meet this guy the first semester of college he is very cool and I got along with him very easily. One night I was over his house with some friends and he asked me if I wanted to have sex. He’s 6’6, Carmel skinned, athletic body, and stimulates my mind I couldn’t resist the offer. We had sex and it was okay we cuddled afterwards and the next day he dropped me off at my apartment. I saw him again at another party and when I walked passed him he grabbed me and fingered me while his girlfriend was behind him! We saw each other again at waffle house and he texted me and asked if I was coming over I told him no I was going to another guys house and he got upset. I ended up going to his place but it was weird because his girlfriend was there and he starred at me the whole time. When I was getting ready to leave he stared at me as I left and that was the last time we seen or spoke to one another.