I dont see anything wrong with being attracted to someone and liking to talk to them or listen to them, its up to you to draw where the boundaries are. If he tells you his problems and you dont mind listening or making suggestions than i see absolutely nothing wrong with that either. As far as him talking about his wife, he may be a cad or he may just feel that he can talk freely around you if you are a good listener. In here and in real life i often hear women talking about something they dont like about their husbands or making disparaging comments, so its not just a man thing. The grass always looks greener on the other side. If in general you work well with him, and you have a handle on the work relationship, i dont see why you would have to change work partners. People feel attraction many times for other people for various reasons, it doesnt mean that they are ready to jump into bed with them. I think it goes back to the question of wether men and women can be friends.