I often see these guys what are whipped by their girlfreind, but I wonder, how did they even enter a relationship to begin with ? Every time I feel a girl starting to one-up me I feel like I am loosing her.
You'd be surprised that being "nice" in and of itself is actually a trait most women LIKE. However there is a difference and a HUGE difference between being "nice" and being a doormat.
Likely what happens is the girl appreciates their niceness, they act chill and cool and after a few dates they have sex and things progress and it's not until a few months in where he starts acting like a doormat when his girlfriend either starts sh!t testing him due to perceived weaknesses she senses in him that she needs to clarify, or he gets desperate or needy at some point over something minor like her not answering a text within a certain time.
Then she starts losing respect for him...she doesn't break up with him but starts seeing his flaws more until it becomes normal that he acts like a doormat. Then she enjoys the power for a while until ultimately her respect level goes to zero and she dumps him, but not before trying many things to get him to dump her, of course unsuccessfully.