How would you feel about your relationship with your wife if you were dating someone you had strong feeling for? Are you missing a good relationship or are you missing her?
It may just be that you and your wife have grown apart. Or maybe she is just overwhelmed with NRE, that she is not appreciating what she has with you. NRE generally lasts for about 6 months (unless it is a long distance relationsyhip).
I wish you well.