How do you stop being head over heels over someone?

There is this one man I met on his business trip to my country. I was getting over my ex which broke up with me 3 months prior and thought I was never going to get over the heart break. But once I met this one man (he's 37) and I'm 24....I was completely infatuated with him. We went to dinner the next day, and I was totally in "awe" with him and so happy that he got my mind off my ex. (I rarely like someone this much...he was a total gentleman). He was up front with my over dinner and told me that he was been separated from his wife from a year and they have a 7 year old son together. We talked about relationships and feelings (he was going through grief over the fact that his wife has cheated on him numerous of times and he wasn't sure whether he wanted to reconcile with her and give it another go like she insisted for their child. Anyway, the next day was his flight and we have been in contact for 3 months now talking back and forth and really enjoying each other's company. I think I may have fallen for him hard and he likes me a lot too....but realistically it's obvious we're not going to be together as he has a serious career in his country and a son who he adores. How do I just stop thinking about him altogether and start to date? My mind is just stuck with him and it doesn't help we talk everyday. And I never ask about whether or not they are making it work with his wife or not because clearly that is none of my business nor would that really matter. UGH! :( Any suggestions on how to go about this?