It’s been a month and I’m still not completely over my ex but he moved on?

My ex was my first love, my first boyfriend, and my first kiss. (I’m 17) I know I’m young and I will eventually get over it but I’ve still been a little sad/angry over it. We were really close and then he just dumped me like we were nothing and it hurt and then he managed to get a new girlfriend the next week and then another one that he is dating now.
I’m still really bitter over the whole thing and sometimes I would think about how I would act like I couldn’t give a flying crap about him and his new girlfriend if I were to see them in public… even though that would hurt so much if I did see them together…
Is it bad that I still feel this way? I’m slowly moving on (surprisingly I was worse)

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