My wife says that I always put my needs before hers. She felt as if she was always "2nd". She has built up resentment for years, and it was all unbeknownst to me.
I was also drinking more than she wanted me to, but have since quite entirely since December 6. She did not drink very much at all, but now regularly has a glass of wine at dinner. Ironic.
I do not believe there is anyone else, she is just unhappy with her life, and feels that I am the main source of the unhappiness.