Im confused on why i got ghosted

Last week on a Tuesday I met a guy on public transport on my way to university. He saw me in the morning and again when I was heading home later that day. He noticed me first, and started a conversation by asking if I take public transport every day, and he seemed very nervous while talking to me. I got the vibe that he was physically attracted to me. We ended up exchanging numbers and Instagram, and for a few days we were texting pretty flirtatiously. He even started waking up earlier than usual just to catch the same train as me so we could see each other again, which I thought was cute. On Friday, he admitted he found me really attractive and was very sexually attracted to me. He also told me he’d “did things” to the thought of me, which honestly didn’t bother me because I was attracted to him too. One important detail: we both have a sarcastic sense of humor with each other. The next day I sent him a sarcastic Instagram reel basically saying “stop hitting on me,” and I made it clear I was joking. For some reason he took it really offensively, and after that he completely ghosted me. Now he avoids me altogether, and I’m honestly so confused because he seemed extremely into me before. For context, I’m pretty conventionally attractive (based on what others have told me), and I haven’t really experienced rejection before, so this is throwing me off. I actually started to develop feelings for him. Does anyone have advice on how I should handle this or what might have happened here? I'm like so down bad for this man omg.