I'm willing to bet these last 2 guys are right.
Maybe there's something about her that appeals to you (hair color/face/body type preferences) that stuck in your memory subconsciously...but you're married, so forget about her.
There's always a change you might see someone you think is attactive, but you married your wife for reasons beyond the physical. You two share (hopefully) something a lot deeper and permanent than you can find with anyone else. That's why you got married.
What is happening...this is a football site and it's not even the offseason!