What dose it mean when your crush texts you saying "sup"?

Sofia_14
So 3 period I was in class and I was going a live stream on Instagram and my crush was active at the same time and I get a text from my crush while I was on live. And he texted me saying "sup", I was freaking out about him texting me. And I ended the live so I can text him back so I did, and 2 minutes of texting him he ask me something and he was asking on what I told his bestfriend in 1 period and he wanted to know why I asked his bestfriend, and later that day like after school I was walking home with him and I ask him why he texted me in class while I was doing the live, and he said "because I wanted to that's why I texted you". I was confused because he never texted me when I was in class or when he was active on Instagram. So like what dose that mean, dose he like me or he doesn't like me, he just friend zoned me?
What dose it mean when your crush texts you saying "sup"?
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