unusual boy situation, please help. please!!!

I’ll try to keep this as short as possible. this new guy started working at my job in february. he was 19, I was 17 (not the point but just fyi).

I clicked with him immediately. it was easier to talk with him than anyone I knew, and everyday at work we would spend the whole day talking, laughing, just enjoying each other.

I worked with him every friday (I had school and worked at the restaurant fri-sun, he worked it full time mon-fri) and in late march I started wondering why I always looked forward to fridays. I knew from the get-go that I really liked him as a person and a friend. but lately there had been sexual tension as well. I realized that I really, really liked him.

march and april flew by, with us spending every friday night together and growing closer and closer. soon talking turned into flirting. he would grab my waist, hug me from behind, whisper in my ear, etc. (I would push him away if I didn’t like him so much, but I was already convinced that I loved him, so I ate it up).

he would say things like “I missed you” “you’re the reason I come to work” “you’re i my favorite person” which turned into “I love you” “you’re beautiful” “you have a beautiful soul” “I feel like we connect on a different level”

keep in mind, we’d never held hands or kissed. he would hug me and put his arm around me, but nothing more. BUT he never acknowledged what was going on. he never suggested we were dating or even had feelings for each other. but everyone around the restaurant started noticing too. saying “damn, y’all are in love.” I was.

by may we were hanging out after work, eating out together and going on night drives alone. we talked about everything. I felt like he was my soulmate. I would never relate to anyone more and no one else would get me like he did. of course I was surprised he hadn’t made a move, but I thought maybe he was waiting for me to turn 18, which of course I understood.

one night, we were sitting at the bar at the restaurant after work, chatting with a couple of other coworkers. everything was fine, when suddenly, out of the blue, he casually mentions HIS GIRLFRIEND. just casually. I was in complete shock.

naturally, I went home and cried. I threw things, screamed, etc. this couldn’t be true. but conveniently, the next day I was leaving for summer camp for 4 weeks. this gave me time to think. but nothing changed. I still loved him.

sure enough, when I came back everything was the same. when I walked in he ran up to me, hugged me tight, and said “there’s my favorite girl.” I felt like I had come home.

my dumbass pretended like I never heard him say “girlfriend.” I would see her on his snapchat, and his lock screen. but he would still tell me that I’m beautiful, and he loves me, and I’m his “soulmate.”

I know he’s a good man, which is why he’d never straight up cheat. but he’s obviously denying what’s happening with us, and everyone has noticed. obviously I feel horrible for what’s going on, but I can’t resist. I love him and I love every minute I spend with him.

during the summer we worked 4 or 5 days a week together, and we were basically a couple during that time, although we never really kissed or anything. we loved each other.

he told me that he was leaving for college on august 11th, and the 10th was our last day working together. BUT he would be back to work winter, spring, and summer break.

during our last day, we were attached at the hip, cherishing every moment we had until he left for 4 months. he always asked me to sing for him, and I finally did. he told me I had he most beautiful voice he’s ever heard. we stayed at work until 3 am drinking and dragging out our time together. he drunkenly told me that he’d miss me so much he didn’t know how he was going to survive. finally, we went home. I cried for hours.

so here I am. I miss him a lot. a lot a lot. I don’t know what to do when he comes back. I don’t know how to handle the situation. I don’t know how to get over him because he’s the only person I’ve ever really, truly, loved.

advice?