What am I supposed to do?

i'm texting this really cute guy and he's shown great interest in me, after 3 days of talking he asks me to be his girlfriend, i say no telling him to wait a little because well we don't know eachother, he says alright. we keep texting and flirting and he sends me these tiktoks about our futures together and now today he randomly texted me he doesn't know anymore, it's going too fast, he's not sure he wants a relationship. i tell him i'll wait and be his friend as long as he needs, he asks me back 'what if i never come' and i'm just like- what the fuck dude- because he asked me out 3 days ago and now it's moving too fast? he's the reason it's going to fast, i ask him if he just please won't block me out, i want to be his friend and be there for him, but he just says 'i'll try'. I'm so confused can anyone help me? did i do something wrong to make him crawl back?

What am I supposed to do?
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