He realizes at an early age that being nice to women gets him a lot of friends (but no pussy), one even told him he's too much of a nice to fuck. Idealistic Tupac then goes on to explaining his white knight strategy for getting all the girls, essentially get girls to reject Chad and only accept nice-guy bevaiour. Clearly it didn't work out.
Later on in life he comes to accept that "btiches ain't shit". If you dealing with a cool female (a unicorn) that's cool but if you dealing with a bitch you need to break her ass and shake her ass. At this point in his career he's dealing exclusively with 10s.