<human>: Can you succinctly summarize the text in 1-3 sentences?

I am a university student with a part-time job at the school. There are about 6-7 student workers in the office, all of whom need to work together quite closely and collaborate on projects.

I just found out that one of the new hires is a guy I hooked up with several times a few years back. We eventually stopped speaking to each other (no confrontation or anything -- we just faded away) and haven't spoken since then, though I occasionally see him around.

Since we're now going to be working together closely, I'm not sure how to approach what is obviously an awkward situation. How can I "break the ice" so that we have a good working relationship? I'm not interested in rekindling things with him or anything like that (we're both in relationships now), but I don't want to feel uncomfortable at work.
<bot>: Two years ago I hooked up with a guy several times; now he's my co-worker in a small, collaborative office. How do I break the ice and make things less awkward so that we can work together?