Why do guys put up a front?

sthrnsweeti
My ex and I were together for almost a year and the whole time we were together he was always a gentleman and never let me pay for anything. He was doing so good getting his life together and when he talked about the future as a we instead of a me. Well he basically ended things with me and of course I'm still crazy about him

Now that we broke up his brother (who we met through) tells me how he's always been a loser and a gold digger. He apparently tells my ex that he was an idiot for letting me go and my ex never says anything about it. He tells me that my ex does nothing with himself and acts like he has no motivation to get himself together. Like he has no job now and he sleeps all day and is a complete bum

I can't understand why he would put up those front of being such a decent guy for the whole time we were together? I'm not saying I want him back, I just don't understand? Was he really just an asshole/womanizer or was he really trying to become a better guy?
Why do guys put up a front?
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