<human>: Can you summarize the given text in a few sentences?

How we know each other: 

I met Bob a year ago through work. The building has thousands of people so I don't work directly with him. However, we do hang out in the same work social circle/lunch group/happy hour group. 

The past: 

A year ago during social events where alcohol was involved he started showing interest. I asked him out, he turned me down and referred to work as the reason. We did hook up once, and brushed it aside. I was annoyed that the next morning he just quickly left. For months, he avoided me, made things awkward. Ok, he's not interested, I moved on.

The present: 

Since then I've dated other people. I'm single right now. We got over the initial awkwardness and we get along just fine now, I see him a lot at work. On a ski trip stayed up late each night, chatted a lot about life, it was nice.This weekend I went out with my friends and found him out. Bob was with some friends including his roommate, Jon. Jon came on to me. We danced, and had fun, he was totally into me. Meanwhile, my friends noticed Bob looking and Jon and I all night. They thought Jon was nice, so they tried to keep Bob away from me. My interest is always Bob. Eventually, I found my way to him and we left together. The next morning wasn't too awkward, I drove him home.

My friends were chatting with Jon and they asked him if he was interested in me. What it came down to is: "No I can't be interested in her Bob really likes her. We live together, he talks about her. He really really likes her."

The question:

I had given up on pursuing anything with Bob. Knowing that he is into me is confusing. I'm wondering if I should tell him (again) that I am interested in him. 

Any outlook is helpful. Thanks!
<bot>: I've been interested in a guy for a long time. I made a move last year and he turned me down. I just found out he's really into me and don't know what to do about it.