I love him and I don't know what to do

Before I start, this is a really complicated situation. Everyone who has heard it, has said those words to me and all I can do is completely agree. I'm in love with my best friend who has a long distance girlfriend. I met him my freshman year of college through my room mate and we instantly clicked. I've never been so close and trusted someone so much in such a short time period. The only people who actually beat him, is my mom and sister and they have had years over him. I don't know if it's possible to fall in love with someone so fast or fall this much in love in only a few months. We became such great friends and about two months into our friendship, his girlfriend (we'll call her Lacy) and him (we'll call him Jack) went on a break for about 3 months. Now I was kind of messing around with a guy at the time and nothing ever happened between us. We had some sleepovers when our roommates were out of town but we only ever cuddled. Christmas break came though and he lives a few hours from me and we weren't going to be able to see each other. Jack and I texted every day and called each other once. I missed him so much but I also figured it would be because we were so close, not that I had feelings for him. Anyways, when we get back to school, Jack had started dating Lacy again and I even met someone. The sleepovers didn't stop and actually happened more frequently. It just never occurred us to stop I guess. At this point, I broke up with that guy because I realized I did have feelings for Jack and it wasn't fair of me to continue on with him for either of us. The rest of the semester I realized that I had fallen for him but I knew I couldn't go after him. I mean he was with Lacy and they had been together for 2 years. She even has had cancer and they fought through it together. How could I break that up? I didn't want to do that. My morals were kicking in saying I shouldn't be so selfish and try to end that. I was going to tell him that last week of school but a friend of mine convinced me not to because I would lose him as a friend and I don't want that at all. I've never connected with someone, a guy for that matter, like this. I've never felt this way about anyone. He makes me happy just by being there. I love him even though he is a real idiot and has some issues (which I won't get into). I have never felt safer with anyone else. When he hugs me, the whole world goes away and it's just us. I feel like I can tackle whatever the world throws at me because I have him there supporting me. So I decided I didn't stand a chance against her and this entire summer I've had to deal with a broken heart because even though he never said anything, I felt like I had lost him. I was so angry and upset that I didn't even get to try and be with him. I didn't even get a chance to show him how much I loved him. I tried moving on. Tried forgetting about him. Tried meeting new people and maybe another guy. It didn't work though. I still only want him. We're back at school now and since we didn't stop being friends, we are continuing to hangout. I mentioned that we couldn't have sleepovers anymore because it didn't seem right. I didn't tell him it was because it hurt too much. Jack thought it wasn't that huge and yes it was weird but he didn't see a need to stop. It's just cuddling after all. Now another guy is interested in me but I feel nothing towards Chase (we'll call him that). He isn't Jack. My issue is, do I tell Jack how I feel at least? Or should I keep pretending we are just friends? I don't want to hurt him or make him choose. I just want him to know what's going on. When something huge happens, he's the one I want to talk to and it's killing me not being able to talk about this. I also think if I say something I could get closure. What should I do?

dont tell him and jast think of that get if u take her many wont she ba hurt and heart broken if it was u would u be happy if some1do that