Why some man always blame the wife for?

for them having an affair, i mean they always blame 1.she gained weight, well yeah but she had your baby.2. she is boring in bed, well obviously they are not doing exciting that will make it interesting for the wife. she does your laundry, cooks, takes care of everything in the house, and on top of that most of them have a job too. and this is also true for some man who have their wives cheating on them. why can they just say i mess up big time, and be a big man and be honest. instead they want to keep the affair a secret and still be with the wife who was so horrible. there is no xcuse for hurting the one you love or once loved. and to make it worst they cheat with this females that are open to be with anyone, they are like walmart open 24/7. yeah they fall for this females who only want to get the thrill of feeling superior than the wife, or if they have (cheater) have money they are attracted to the cash. but no they believe they are so great in everything, that they are so shallow that a younger female, male is gonna be more attracted to an older person than a younger one. now i know that they are married couples who are in love and there is a big gap in ages. so this is has nothing to do with the ones who have affairs. the reason why i'm saying this is cuz its so easy to walk away from a marriage or relationship that is not making you happy. no one makes no one stay with no one if you do not want to. the bottom line is that the cheaters are so full of them selves that they always try to find an excuse to justify the wrong doing in this case cheating, with the easiest way, blaming the other spouse. and no i'm not going through any of this, for this i'm thankful, well so far i hope never lol. but if some day it would happen the excuse of me being the one at fault for whatever reason would be just so unfair. since me like many other married people give 120% in everything in the marriage. not saying I'm perfect but i would rather be honest to the man man I married, if some day i would stop being attracted to him or stop loving him. i would respect him not to betray him in the lowest form of betrayal, which is cheating.