You can't forget about him because you can't have him. Instead of picturing other men as him, try picturing other men as being married to someone else. Like busgirl said, (who's to say that in a couple of years he wont feel "tied down" to you and refer to you as "the wife"?) Don't do to others husbands what you wouldn't want done to yours. If he leads you on, you don't have to take the bait...even if you want to. Take his marraige seriously even if he doesn't.

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Impossible is a word only to be found in the dictionary of fools.

Napoleon I