Boyfriend not into sex??

I need advice and opinions please. Me and my boyfriend have sex, pretty frequently. We only get to see eachother for a few hours once or twice a week. When we do see eachother it’s normally non stop sex.. he basically tackles me into bed when he sees me and then after like 4 rounds we will end up talking and then we usually go out to eat. Today when I went to see him I hadn’t seen him in 4-5 days and we had been fighting those whole 4-5 days so I thought he would be a little more excited to see me.. but when he picked me up he didn’t initiate kissing or anything, and then we got back to his dorm and I started kissing him and kinda initiating him and we had sex but during sex he had his head turned away from me he wasn’t really doing anything he wasn’t kissing me and he was being abnormally quiet... I was his first (and he was 19 with like a million girlfriends before me) I know that sex is really important to him so I wouldn’t normally assume he was cheating but he just seemed off and like idk if he isn’t cheating that probably means he is like getting tired of sex with me but here are the messages... he kinda tries to put my mind at ease but

tell me if I am being dramatic