The best part is you recognize the behavior and you see it for what it is, I would get some good suggestion ideas from a C on setting those boundaries.
Flip,
It's defiently a tight line to walk. You give a guy the reassurance and they want the whole thing. A good thing can be to spend time with your S, and possibly explain if the questioning is going to continue then I'm leaving. That way you may provide the reassurance through physical presence but without all the pestering.
On a side note I heard on the radio that some study found that men talk more then women, sure seems to be true in this context.
