How do I deal with this help please

I liked him, I'm pretty sure he liked me too... we flirted back and forth but then he became hella dry

Today he shows up with a brand new girlfriend bro I'm heartbroken, why would you flirt with me and give me hints that u like me if it gonna start dating somebody else

He doesn't text me anymore, he doesn't smile at me anymore, he's distant and emotionless, it doesn't even look like him and his "gf" are actually dating now 💔