Friend,
I guess at that age girls are probably more impressed seeing a fashion watch like DKNY, Guess, Chanel.....watch. The back sticker is still on so I gather you did not impress your girl too much and decided not to wear it anymore.

Your watch runs on the very reliable work horse
7T62 movement which is still in use in many recent seiko models; you also see it in the recent Seiko-Barcelona chronograph I believe. If you say you got the watch over 10 years back, from the serial number, watch was probably made in
June 2002. So if you bought it for prom nite at the end of 2002 then it probably just arrived a the the shop from which you bought the watch when you bought it.
Hope the above helps.