I know what you are going through is hard, but I think there are a few things that you can do to help you not focus on your situation, at least for a while.
Look all you really have in this life is this moment. Right here and right now. Stop for a second and breathe. Notice what if feels like to just sit and breathe. Sit for a moment and just listen to the sounds you hear. You seem so distracted in this relationship, what your wife may feel, what she may do, that you are missing the simple small things in life that, frankly, are all we really have.
I'm a man . . . But I can change . . . If I have to . . . I guess . . .