Maybe it's just me but after years on MN and watching a few real life friends go through tough break ups, I'm now 100% in the "don't believe a word he says about his ex" camp. Which of course is ridiculous - women aren't universally perfect and rational in relationships but.... well, it seems to me that a LOT of the time he's just talking absolute rubbish!
A few of my favourites:
"His ex won't let him see the children" [amazing how seldom the man attempts to take this further via court/mediation etc]
"She just wants more maintenance from him/she'll spend all the money on herself while he then has to pay for everything for the children" - a bit of digging usually finds that he spotted her getting her hair done or going to the pub and is now outraged that the £150 he gives her is being wasted on fripperies.....
"She was controlling". I love this one. 9/10 she just objected to him going out on the piss every weekend while she was at home with 2 toddlers!
"She's trying to take me to the cleaners - I worked hard for that money!". DH has had a few conversations with male friends who spout this in all male environments... DH is less than sympathetic.
Any others you've all seen and heard to share?