ash59 said:
Yep, I've had it a lot in the past and have only woken up to it after splitting with a few birds and then realising that they have taken the right royal pee out of me. My motto these days is **** everyone else and look after number 1
If you are too nice to people (especially women) then they see it as a licence to treat you like a doormat 
I do have my occasional Karma trips, but I would never let a girlfriend take advantage of my good nature again