the fundamental problem of being a nice guy is:

1) you will have a high chance ending in the "just a nice guy" list of hers...and often, women will keep that list in the lowest priority. their mentality is always "nice = boring and safe"

2) nice guys seems out of this world, at least to their mind. so if you try to be a nice guy (dont say try la, lets say just being yrself), inside their head they are thinking, "this guy is for real? can believe whatever he is saying ar" etc etc.
It seems like girls are far easier believing jerks because they seem more "real" compared to nice guys. pretty messed up huh?

3) not all nice guys are actually nice. infact, noone is completely nice. everyone has issues. its a matter of how serious those issues are...and unfortunately, women WILL always look into those issue as BIG issues, and then disregard the other better things about "nice guys". but for badass, their badness is obvious so women will OVERLOOK their issues and try to look for their GOODNESS. again, pretty messed up.

these are my personal opinion, and also partly observation and experiance. i have seen and met and been told so many times...and i can say that no.3 is the problem with most people in facing r/ship problem. so my opinion for those who are looking for a partner...DONT LISTEN on whether to be a BAD/GOOD GUY. its a waste of time. why? simple...dont change yrself for anyone...especially if its changing for the worst. if u genuinely want be a nice guy, go ahead...but not for another women's request.

read no.3 and understand what i meant. GENUINE partners will look into what is good in you...and not just accept you are an overall good guy, but keep looking into yr weakness and at the end of the day, give u craps like "you're a good guy blah blah blah, BUT blah bla blah". although "not so good guys" have advantage because of it, you are still you.

this is not ALL WOMEN, but MAJORITY of it is like that. it is human nature, we only want to see what we want to see, and if it is not there, we will try to "make" it there.

guys are not so serious in this aspect because we are more visually attracted, but girls are emotional, so to them, everything is feeling. they like the good guy feeling, but cannot escape finding problems in them. they dont want to have a jerk as their partner, but keep believing they can change them or keep trying to find 'good' in them.