Do you think it was my fault that he disappeared?

A classmate of mine, 31 year old man. I feel like he liked me but we never got together. He was very career oriented. I simply asked him if he's single on a texting app, using a different number, he trolled me and I sort of trolled him back.
He disappeared like a week after I had used a fake number to text him. I don't know if he knows its me. He shut off his career account and all his connections can't find him. He uses an iphone and all our messages used to be in blue but now they're all green. His other friends who texted him also see its not delivered in green.
When he trolled me, he said his phone broke, he's in Japan and has 30 phones but I don't think he was serious when he said all that. He has a computer sceince background. Why did he disappear all of a sudden? Is it just because I texted him using an anonymous number?

Added (1). It's not like him to shut off all connections and delete everything. Someone says he feels its an infosec reason that he disappeared. He took long to build connections with everyone. It's been weeks and no one can find him.
Can any you please help figure out WHY someone would do this and what you think might have happened?
He recently graduated with a B.S. Degree.

Added (2). I feel bad if it were my fault, I felt like he liked me before but I never told him, I didn't like him until I realized he was gone.

Maybe you should ask him

Just text him from the number you gave and say, "Is this so and so? This is what's her name! How's it going?"

I don't think its your fault but he does sound very strange and his behavior is bizarre. You mention he is 31 but he sure isn't acting like an adult. I wouldn't want anything to do with someone like that.

Maybe he didn't know where the call was coming from