What do I do?! I may have potentially ruined a good friendship with a bunch

[curious]

of mind games and cowardice.? A guy friend of mine(Dino) and I have been friends for over a year now. But we've only just begun to get close over the past two months. He's had a track record of annoying me, and I have a record for loathing him. Lately though, since our friends have become less apart of our lives, we've seen different sides of each other. I care for him a lot now. At some point in the past, he liked me I believe, but I made it clear to him that I wasn't interested. Then a few months after that, we both drank too much, and slept together. The following morning, I asked him if he liked me, and he shot me down. NOW here we are... and he leaves for another state for a month today! I bought him a going away gift he loved, but didn't tell him how I felt now for fear of ruining his trip and or our friendship. I wish we hadn't played so many juvenile games. Now I'm scared to tell him that I care for him. He makes it obvious that he feels something for me, and then he just gets distant out of nowhere. But there is so much about him I like...I just can't let this go. He's so talented, and he deserves to be with someone with his best interests at heart, for once! So I was planning on telling him how I felt when he came back. A month of keeping this bottled up. And what if I tell him, and I just destroy the friendship we've recently built? That wouldn't be worth it at all.