A friend of mine recently said this about reassurance:
Reassurance is the flip side of the same OCD coin, even though we don't always recognize that. If the fear is "heads," reassurance is "tails."
We seek reassurance to bring our anxiety, or fear, down. Anything that brings our fear down (in an artificially quicker way) is considered a compulsion. Performing compulsions only reinforces obsessions (fear inducing thoughts). So . . . the moral of the story? We need to stop seeking reassurance.
A lot easier said than done.