I'm in Love with my ex, who happens to be engaged, what should I do?

totally a long question and i stopped reading half way thru... but my advise would be to just TELL HER HOW YOU FEEL!! this happened with me and my ex and sounds pretty similar and i let him know how i felt and spilled my guts.. and it didn't work out the way i would have liked but at least now i have closure! and can look at that relationship from a different perspective and not worrying bout 'what if...'