I would say keep it to yourself.....but honestly its good to get some closure. Did you ever tell him why you never went out with him? Maybe when talking .....just mention to im that you did like him alot back then, but that your parents were kinda strict so therefore you couldn't date anyone. So therefore explain your constant rejection.....back in the day....

I mean yeah the timing is off for the two of you...but maybe just casually mention that......and at least get it out there. If you want to go into how you currently feel....that might be opening up a can of worms. But then again if you want to thats your choice. But also explain to him that all you ever wanted for him is to be happy and if his fiancee makes him happy then let him know your happy for him.

Just remember.... He is engaged so don't expect him to break it off and come rushing to you.

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Appreciate the good times and learn from the bad times....