if a guy was walking down the street and a stray dog followed him home, does that make the dog his? if the dog then saw you and decided to follow you home the next day, does that then make you a thief?
your argument is flawed in that women are not property. you do not allow for the choice they themselves make...else in the context of your parrallel, the merchandise would be stealing itself
at the end of the day the ultimate choice, and therefore ultimate responsibility, lies in the hands of the woman being courted.
some people just dont like the ugly reality, which is that everyone is self serving, people will dump their partner for a better option, and that life is not a Disney movie.