Sharing Our Innermost Thoughts

So there’s a guy.
He approached me first.
Our classmates started talking about us.
Then one of my best friend suggested me to tell him that I’m interested in him too. But at first we were like friends and then people started talking about us and at that moment I got excited. But I was never been into this guy. But as je asked me, I just said I’m interested in him (I didn’t said I like or love him). Them from 15th may we started talking with each other like everyday and now till after 2pm. It was all right. And then suddenly his Instagram friend who had a quarrel with him a few days ago , cam back to his life. They’ve sorted out their matter. And from like evening @6pm . He’s ignoring my texts,calls and msgs. Like dude it was you who gave me your attention and now what the hell are you doing out of sudden. I’m craving for his attention. And I came to know that he was online but he didn’t even let my message go seen…
What should I do?