When a married man loves you?

Say you were friends with a man or woman who was married or in a long term relationship i.e. over 5 years, or with kids etc. Imagine that you both knew that under different circumstances you would have been together, that you are both deeply compatible and had strong feelings and attraction for each other. How would you feel if that same married friend told you that they felt they could never see you again due to how they felt about you and that they were concerned about what might happen between you if you continued to see each other.

Basically they are telling you they are so crazy about you that they can't control themselves around you any longer, that the feelings between you are too strong to continue as only friends.

How would that make you feel, would you agree or would you want to keep trying to be friends?