If this is just an infatuation, then why has it last so long?

Think about this. You only see the other guy at work when he's in charge, well dressed, well groomed, completely put together, and running the show confidently. You see your husband in his boxers, rumpled and unshaved, kissing you with his awful morning breath, farting and scratching, first thing in the morning when he's at his worst, and then at night collapsed on the sofa snoring or watching the game without moving except to reach for his beer. You're not seeing the married co-worker at those times, when he looks pretty much the same as your husband. So do this: Imagine a life with your co-worker. Don't just stop at the and cuddling. Imagine the cranky in-laws, the fights over money, the disagreements over what to do in bed (everybody has them), the 101 little personal-habits disagreements you'd suffer with him if you left your husband and moved in with this so-called ideal guy. Imagine him seeing you at your worst and how he'd react. Imagine his relationship with you cooling. Then imagine some hot little honey at the office starts appearing around the edges of your life .... Well, that's an exercise. If you can get that far in your imagination and you still want this new guy, then go for it ... but I bet you can talk yourself into staying with your improved husband after you work through these completely natural and delicious feelings for this work hottie -- who is much better in your fantasy life than he'd ever be for real. Good luck to you and hubby.