Why do men do this?

Im f17 and its the first time I've liked a guy. He walked me home, asked me out to a cinema date and made playlist for me only for me to wake up the next day to him ghosting me and the playlist being renamed after his ex.

I don't understand? I've never been in a relationship and I always thought when girls spoke about this stuff it was kinda exaggerated for humour, especially because I grew up in a house with older brothers who are respectful to girls. And I really thought he liked me?

Every woman I've told about this has been like 'what did you expect he's a man'. I'm so confused am I supposed to think this is normal? it's so baffling and upsetting to me. Why waste my time.