Most Helpful Guy
He's an ex and as a "friend", I suspect she won't be hearing from you much at all in the future either. You certainly can't control people.
At the same time, people become couples for a reason. You remember that game where toddlers put different shaped pieces into a hollow ball? The star goes through the star opening, the round one through the round one, and so on? Consider the fact that he doesn't fit into your life and you won't match his. Let him go and let your friend deal with his "differences". He's soon to be her problem to deal with.
Smile, hold your head high and go on with YOUR life. There's a lot of people out there to gain new friends and a new boyfriend. You're going to be OK.