Well, I'm going to tell you two very contradictory things.
The first is, you need to do a better job of OWNING your part in this marriage breakdown. You talk about arguments yet you dismiss the negative effect they may have had on the marriage. You resent the mother-in-law and blame her for her daughter's actions, yet you were living in HER home? You say you supported the family well yet you only have enough money to live with your dad in his retirement home? Without knowing your sitch, it sounds like she MAY have had legitimate complaints about you being angry, ungrateful, and not a good provider. What part of this might be true and how can you change to do better?
The second, contradictory thing is - it's possible that none of this has anything to do with you. People who have gastric surgery are at increased risk for developing compulsive gambling, sex addictions, and other addictive behaviors. It is not known exactly why this happens, although it has also been seen in people treated with drugs for Parkinson's disease. Some have theorized that when you take away the food addiction, they substitute another addiction. It may have to do with the dopamine reward system in the brain.
Either way, the only thing to do is work on being a better YOU, and a better father. Your wife is going through something that you have no control over.
