Black11, 11:11 isn't always connected to twin flames. It is also the hour of the Lightworker. If you see it frequently, it may be either a calling from your twin flame, or just a sign to pay attention to your surroundings and listen to your guides. I see it frequently and have also projected and found my twin flame, but we have yet to reunite in the physical. Trust me when I say if he was truly your twin flame, you would KNOW.
And SerpentQueen, I would say that the guy you described could be your twin flame, as you don't always have to have a romantic relationship. But I have read so many posts on here saying that the relationships between twin flames isn't supposed to be a romantic one, but I couldn't disagree more. In my eyes the relationship between twin flames is the purest love you could think of. I think alot of the people who post that it can't be romantic is just a case of negativity. "Hell hath no fury like a woman scorned" can totally be applied there.