In this case, you must know your own feelings whom you like or love and what is the reason behind that. Just for one promotion you can’t break the trust and the mutual bond in your relationship with your wife. Marriage is not at all a joke and you can’t switch from one person to the other simply for your greed of your reputation or the greed of making, earning more money. The person who is living with you at present can’t even think of doing this and now just look how she cares for you and she is also being loyal with you; you can’t break her heart or how can you think about it.You should directly tell to your boss that more than promotion you care for your wife’s feeling and than apologises her.