Is this concerning behavior?

So I F21 have been friends with this guy M21 for about a year now since we live on campus dormitory we met through mutual friends and just randomly started talking at one point he began texting me every day and then through his friends I found out he liked me.
He’s very shy and introverted but nice however I only saw him as a friend so I politely explained that I have no romantic feelings towards him back in July , I believe he took it well cause he said he’d like to remain friends but he didn’t stop texting me even though I try not to reply too quickly but every time I’d go for a long time without replying he’d go crazy with texting if everything’s okay.

And he keeps texting almost every day even if I don’t reply. Now we’re back on campus and I haven’t hung out with him partly because I’m busy and partly because I’m uncomfortable but he keeps insisting on seeing me and when i didn’t respond immediately he even texted me on a WHOLE DIFFERENT PLATFORM that we had never texted on before and that honestly creeped me out a bit…maybe im overthinking it but it just made me feel some type of way which has never happened before…

is it normal for someone to keep trying to get you to respond to their messages? I’ve already explained I’m not interested…what more can I do? Is this normal behavior?

Is this concerning behavior?
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