I think what's even more depressing is the women who seem to believe it over and over again 
I have a friend - pretty, clever (apart from when it comes to men) successful...
She had a 2 year affair with married man #1 - He had 2 girls 15 and 17... his wife was lazy, she never did anything in the house, she didn't work - he had to cook, clean, look after the girls, he did everything. She didn't even care about him - when he had the operation for his hemorrhoids, she didn't even text him to ask how he was - my friend had to buy him an inflatable doughnut to sit on as that BITCH* didn't even do that...... he was in love with my friend - they were meant to be together, he was going to leave when both daughters went to Uni, he couldn't leave before as he didn't want them to ruin their uni chances as they were so upset their parents were splitting.
He wouldn't reply for ages and then guilt trip my friend when he did 'So I'm not allowed to enjoy my life?' 'So I have to reply within 10 minutes?' yet when she went to the supermarket without her phone she came back to 15 missed calls and loads of texts asking who she was sleeping with?
(*I'm being totally sarcastic, these are the lies he told my friend and she believed them)
... He couldn't leave as his daughter was going through a crisis
.... He couldn't leave as it was too close to Christmas
.... He couldn't leave as they had a cruise booked and despite them NOT have sex for 5 years, he didn't want to cancel as he needed a holiday and would just treat his wife as a friend
.... He couldn't leave because....
....etc etc etc.
Married man #2 - He only married his wife as she was pregnant, he didn't want to leave straight away as his wife would never let him see his son. He was (and still is) very high up in the army and needed to leave his wife in a 'respectful way' as it would harm his career - however, until that point, it's totally OK to have sex at work in the disabled toilets and send loads of smut to each other during work hours - BUT.... my friend MUST respect the fact he doesn't message her outside work hours - that is, unless he has a spare 5 minutes when his wife is somewhere else in which case, my friend must be available, else what is she doing and why isn't she answering the phone to have phone sex?
Engaged man #3.... My friend didn't actually know he was engaged when she met him and he moved in within 4 months. However, she found out he was engaged and had a 4 year old daughter (who he denied was his at first until the fiancé showed my friend the birth certificate) ....... After she chucked him out, he managed to convince her within 3 months that the fiancé was the one that was 'mad' and 'She knew the relationship was over months before' and 'She just wanted to hurt him by ruining the relationship with my friend' and yes.... my friend believed him - cue another 12+ months of him lying, and cheating and lying some more, before she FINALLY kicked him out... he's still been sniffing around her, but I think he's finally left her alone.
This is the thing that gets me - so many red flags... so many lies and the same script again and again and again and yet women believe that 'this time he's telling the truth' 'I know it's usually the script but this time, it's different' - It's staggering.