I'm considering leaving my wife. Any tips?

Do you still have feelings for your wife? Have you told her that you feel this way? If you still love your wife or care about her, I would say you need to tell her the way you are feeling and seek couples counseling. I grew up with my parents not being together, I would suggest not doing that to your son if at all possible. Was your wife ever really affectionate? I think you have a lot of feelings that you haven't discussed with her and at the least you need to tell her how feel and see is she at least tries to change.