This statement humorously highlights a common scenario where some men may initially desire a good woman, but once they are in a relationship with her, they realize that she expects them to improve and be more responsible.
"Dudes Want a Good Woman Until They Start Dating One" suggests that men may be attracted to the idea of being with a woman who is kind, caring, and responsible.
"And Realize She's Gonna Force You to Step Up" implies that when in a relationship with a good woman, she may challenge her partner to be more accountable, mature, and committed. This can involve encouraging him to take on more responsibilities and become a better version of himself.