i understand how you feel, however, i can also feel your wife's pain when the day comes that you have to tell her its goodbye.
I tell you, no breakup is easy, its either you become enemies or the best of friends. Talk things over, and give the love another shot. Maybe you just need some space. Take a vacation, and when u come back, you try to be with her more, do fun stuffs together, bond more, spend time together.. u'll never know what happens, after all, u guys were best friends naman even before..
dont try to have a kid just to save the marriage, make sure of ur feelings first. Because if ever, God forbid, you 2 go separate ways, the child wud be the one who'll suffer more.. God bless. Hope everything wud turn out well.