so many always believe in the "ex-is-crazy" story?

i read and hear so often that the new spouse usually says, his/her ex is crazy, no good, cheated, only wants money and so on. but when you ask, how they know, its usually: he/she told me all about it. now i am not saying you should doubt your partner, but arent there often two sides of the story? anyways, does it make the new spouse feel better about themselves to talk bad about the ex ? and cant they understand if they were left behind for someone else they might act exact the same way as the ex? opinions?

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