You learned a valuable lesson here. This “buyer” if you can even call him that, since he didn’t buy anything, probably picked your profile since you are new and may not have any reviews yet. They count on newbies to not know how the system works, and also play on their eagerness to get their profile going. The psychological manipulation was telling you that they had been scammed before, and want to be sure you won’t scam them. That puts you in defense mode as a newbie here and makes you think (if you fall for it, of course) that you need to outshine that person whom the “buyer” says scammed him. I highly doubt this guy was ever scammed - in fact, they are what they are claiming others are, which is deflection. He was preying on your FOMO (fear of missing out) on making money and getting an order. He succeeded.
There are protections here and solutions, as mariashtelle1 pointed out - but, they only protect those who actually have an order placed.
Move on and never work before a “buyer” places an order.