Does DB'ing work if OW is playing the victim?!?!

[xin]

Issues we have had which H put down to me constantly trying to tell him what to do. I have firm beliefs in being cost effective and energy efficient in our life. Unfortunately my H doesn't share the same beliefs. We constantly disagree on whether to have the air-conditioning on and whether it is ok to leave the lights on when no one is in a room. We have had these issues almost right from the beginning of our R, even before we got married. Because of these "issues", my H said that he has been very unhappy for a long time. My H has threatened divorce at least 2 years before his A, but i didn't realised how serious the threat was because he said he loved me very much afer we made up.

I read a card my H wrote to OW, hoping to change her mind about breaking up with him. He wrote that she is the love of his life. Do I put this down to his state of mind? Is this a M that is worth salvaging?