You can be in love with one person and have a crush on another, but if you're really in love, it's impossible to be really in love with someone else. What you have for this guy at work is infatuation! You don't live with him - you have no idea what he's really like in a relationship - you really don't know him at all! It's a fantasy! What you have with your husband is real! Don't blow a good marriage away on a whim!