What is wrong with me😭

So my boyfriend and I have been together for almost a year and I love him so much! We are together all the time . He does so much for me, he’s been there through rough times, pushes me to do good In school and helps pay for a lot of things I need(vice versa). He’s an amazing boyfriend. He’s 20 &’ I am 18 and just started my first year of college. We plan to get an apartment soon and start our life together, but there’s something 🤦🏽‍♀️ we have been arguing a lot so we have decided to take a break. The arguments range from anywhere. From me not being sexually pleased anymore, to him not liking my attitude, to him lying about shit, to me being disrespectful. I’ve been getting a lot of attention from other boys since I’ve started school , but I turn them down because again I love my boyfriend &’ want a life with him. I want to make this work. My boyfriend isn’t in school, but he works. The other day I went to our local diner around 11pm with my friend and she brought a boy she was talking to, and two of his friends. One of the friends did ask me on a date a while ago and I turned him down, but he remained respectful and we were cool. I rode home with them and I was sitting in the back in the middle. The one who liked me kept touching me face and hand and I kept telling him to stop because I felt weird. Like I wanted him to continue . Then he put his hand on my thigh and was rubbing it so I was like fuck it🤷🏽‍♀️ my friend parks in a park that’s in the woods and we start playing truth or dare. I wasn’t playing but they kept daring the boy to do things to me &’ I would reject it. The boys eventually got dared to take off their shirts. And I couldn’t stop looking at the boy 🤦🏽‍♀️Then he was dared to kiss my neck and I didn’t want that to happen because I knew it would mess with me later on . He was rubbing my leg, asking me if it was okay and o couldn’t help but to get turned on🥴I said no and asked my friend to take my home. Now I can’t stop thinking about hooking up with him. Mind you it’s VERY hard for me and my ex or boyfriend whatever you wanna call him to have sex because I can’t get turned on by him anymore. I’m avoiding being around the other boy because I don’t want to make the attraction stronger. I know I don’t have feelings for this boy, I just want to have sex with him . I feel like an asshole for having these feelings and I don’t know what to do. Can someone give me any advice on what to do, why can’t the one I love turn me on anymore or what this means... please help me😩