I want to scream in a pillow right now.

ughh. dont know what to do. Every time he walks past the aisle I sit in, he smiles at me, even when hes talking to others in a group. He has such a beautiful smile. When he does this i completely lose track of whatever i was doing for a moment. When a bunch of coworkers go for happy hour and people start to leave, hell move closer to me. when weve gone out as a group, we always end up being the last ones together and we have these long conversations where I feel like I really connect with him.
Nothing physical has happened except I kissed him on the cheek when I was drunk once but I apologized afterward. I have a boyfriend, its not going well and Im going to break it off, but it would be really complicated to do so right now, I figured Id do it when I get back to college. (Hes currently occupying the apartment we share at school, I have a lot of valuables there) So I made a vow to myself not to let anything else happen. But then, just recently, coworker tells me he had accepted an internal offer in another country, starting in the Fall. This was supposed to be a secret, but he told me anyway. After this summer I wont be back until I graduate next May. Should I profess my feelings (to both parties) and risk losing of a couple thousand $, and risk a relationship with this coworker whose leaving for an unknown period of time in a few months? Or should I play it safe and keep quiet? I feel like he wouldnt have risked telling me this secret if i didnt mean anything to him. And Im wondering if just the feeling of getting this off my chest now is worth the financial risk. Note: he doesnt work directly with me, but on the same floor. Thanks for listening :)