How do you deal with feeling like a sex object to your own fiancé?!😭

we've been in a long distance relationship, but on Monday, i arrived in Michigan to spend three months with my boyfriend. the first two days i was here, he was off work and he despite the fact i was here, he spent the time gaming. on wednesday, he went back to work (he works afternoons/evenings). all the time im with him he just wants to play video games and have sex. like we havent done anything else. i feel like im just being used for sex. im reletively new to sex, only had one experience before my fiancé. before me, he was a virgin. but it feels like he only wants me when it suits him. i have also recently found out he's been talking to other girls, calling them pretty, etc. how am i suppose to handle this?! it is breaking me apart, i cant lose him. i love him so much, but i feel like im being used!😭😭