“That’s the sense of entitlement that ‘nice guys’ have. They’re being nice for a reward and end up complaining when a certain woman goes to someone else. They think, ‘All these girls go for the bad guys but they don’t want to come to a nice guy like me, why are they so stupid?’ It’s a very insecure mindset that stems from a lack of understanding of what it takes to actually attract a woman and, more crucially, a lack of respect for the individuality of the woman. Like the woman has to fall in love with you because you did all these nice things.”

Source: https://www.buzzfeed.com/kristatorres/nice-guy-explained