Why did he change his Instagram profile after rejecting my confession?

I met a guy in school. He behave weird and special around me. I thought it was love so I fell in love with him. I confessed him on instagram and he rejected. His username was the gamer lobby that time with no bio and no profile pic. Just after a week of my confession, he changed his username twice with his name this time and his dp multiple times. And added a bio as well.

Why did he change his Instagram profile after rejecting my confession?
Post Opinion