I don't think Frankie won the 1st fight. He did lose the 2nd fight, but even then BJ wasn't massacred. He rebounded and blasted Matt Hughes. IMO something happened starting in the 2nd half of 2010, after the Matt Hughes fight that caused his demise and he never recovered from it. It was probably a combination of a lot of things, but it was probably lack of discipline, not training enough or at all, unhealthy, not mixing it up enough, drugs, family issues.
Family can be the strength of a fighter where if you have a good family unit, a good wife/mom/dad, people close to you that basically adapt their lives to yours, making sure your household is in order, your meals cooked, help with fighter management, scheduling and you have all the support you need so you can worry mostly just about training.
But many women, I would suspect are really not that supportive of fighters when they realize that the fight game is 5% glory and 95% pain, recovery, suffering and heartache and everyone is revolving around the fighter/husband/boyfriend and not them which is usually the case with most women where they are used to the world revolving around them.