the syndrome in which an unmarried individual falls in love with an engaged individual, and the engaged with the unmarried, but does nothing until the engaged individual is married. usually leaves both parties in a depressed state.
Bill: What's wrong with you?
Ryan: I'm suffering from Chris Valenti syndrome. This girl I like was engaged and got married, but I'm in love with her and she is in love with me. Guess it's too late now.