What's wrong with my wife ? [I Marriage]

A number of things may be occurring. She may have been over whelmed by the passion and her happiness was expressed with tears (which is my favorite choice). Or (not so great) she is having pangs of guilt because she is seeing someone else on the side or she isnt happy and doesnt want to tell you.

Just observe her behavior. Does she initiate intimacy or is it always on you? Until proven otherwise I would consider only the first choice.