He Started Seeing Someone Else….But Still Likes Me?

I am a college student right now, and last fall this guy had a major crush on me while I was obsessing over a guy who was just a super nice person after all. But I would still flirt with this guy because he was cute and very sweet and would do anything I asked. He plays for our basketball team and I once asked him to help fix a flat tire, and he did not only that, but gave me his jacket as well. He always agreed to hangout or something even if it wasn’t his favorite and would ask if I would be at the games. He would continuously tease me and try to flirt, and his friend would drop hints as well. I simply thought that the other boy was a golden boy who had it everything perfect, and it blinded me to the affection and attention this guy gave me. He continued to act the same way towards me, and by the end of December(3 months later) our winter break was coming up, and when we asked if he was interested in a friend of mine, he said he was talking to a new outside girl who went to school here as well. I believed him; since he does dote on me and has never been untruthful with me in the past, but my friends tried to tell me he was lying because he didn’t want to admit he liked me in front of them. Over break I had a change of heart when the golden boy rejected me and I realized I was very blind that this guy liked me a lot. After winter break passed, we returned to school for spring, and I bumped into him and he acted in the same teasing and flirtatious way he always had with me, pining for my attention and to make me laugh. I noticed out of the corner of my eye a girl give him a nasty look and left, but he stayed and held my gaze with a smile on his face for about 10 more seconds until I told him to go eat the ice cream he was holding lol. I figured this is perfect, I still have a shot with him. I asked him to hangout with a friend of mine, and told him to bring a friend too so it wouldn’t be awkward. I bumped to him the day I was supposed to see him and asked him if he had just gotten up; to which he replied ‘no I was with my girlfriend.’ Despite this, his demeanor was still sweet and flirtatious like it always was with him, and I reminded him of our plans and asked if he was still coming. He said yes right after he ate he’d join us, but his friend couldn’t make it because he had to go to the gym. I figured he would blow us off because of the girlfriend and his friend being busy, but to our surprise, he showed up. While we were altogether, he would do things like stand extremely close to me as I made shots (we were playing pool) or stretch to show off his abs, and would otherwise just sit and watch me. When I sat down with him once, he made the comment ‘I’m not a good finisher…if you know what I mean’ to me and I simply smiled shyly & didn’t reply so he looked at me and asked in a serious tone ‘do you know what I mean?’ And I quickly said ‘yeah’ and got quiet again. I continued to talk on/off with him, and he would always be looking me straight in the eye and watched me as I looked away, and and always seemed to get excited when telling a story to me; or would ask for more detail from me, even if just about how my weekend was, and we once talked for 10 minutes in public, and he would always linger before leaving me. I hadn’t spoken to him for awhile this past week, and as time went on I noticed he would still stare at me from afar, and if I smiled, he would do the same back, and when he came in with his girlfriend, they walked with a lot of space between them, and he looked over and stared at me for 5 seconds straight and she noticed nothing. I did also notice that they go out and eat dinner at the cafeteria together, but with mutual friends. Last night I had to study and passed him in the library alone, so I stopped and asked him if I could study with him and he said ‘sure.’ We were talking a bit and he laughed at some of the things I said, but at one point he took a FaceTime call from someone who seemed to be an old friend, sister or cousin. Some of the things he was saying I laughed at, and he would look up and stare at me for a second or two, and I saw a sparkle in his eye as he smiled at me. He didn’t finish his work before the library closed, so I recommended a place I knew of that was 24/7 and nearby on campus. We went there together and I at one point asked jokingly ‘what’s the better grade, 100 or 84?’ And he replied with ’69’ lol. He never mentions his girlfriend when we talk, unless I ask a question that she is a part of the answer (I asked if his shirt was new he said yeah she got it for me for Valentine’s Day). It is my true feeling that he is a good person and treats his girlfriend well, but cannot help his affection for me, and this is causing him confusion. It is my fear that if I ask him directly out of nowhere to choose, he will out of guilt and confusion tell me he is with her, and asking him if he’ll leave her or who he wants more will be messy, because it may be me but he may not want to leave her either because he has a good heart. Am I wrong in assuming these things? And should I ask him this directly? Or if not how and what should I do? Sincerely, dazed & confused