I'm so sorry for you. Those glimpses of the love you once shared are the most painful. I have those daily, and it takes all my strength and faith to put them in a box to open at a safe time.
I've learned to accept that I still love my wife, but that nothing I can really do will make our M work. Only she can take the steps to repair it. And I'm constantly wondering if I'll be able to accept her back after so much pain.