Why did he ghost?

Met this really cool guy organically through a mutual interest. We’ve been running into each other over the last month or so and he always made an effort to chat me up, ask a lot of thoughtful questions. I told him I was performing some music last week Friday and we exchanged numbers because he wanted me to send him the details. He said he was going to find someone to cover his shift so he could come by. He ended up coming to my show last Friday and lingered afterwards to talk. He ended up asking me out and immediately texted me after the show, saying how he thought I crushed it, sent me his all time favorite musical album, told me to come visit him at work, etc. all good things and all good energy. No sketchy vibes, I was starting to get super excited. I responded to his messages the next day and said I’d love to get together. He loosely made plans for us to have a picnic this weekend so we could hang and listen to some music. I forgot I have to work this weekend, so I texted him telling him we’d have to postpone. I sent him a collaborative playlist and said that it could serve as a placeholder for the picnic- I didn’t want him to think I was blowing him off. I then followed up and asked if he was free some time this week for an alternative hang. He hasn’t responded to that/ I haven’t heard from him since Sunday. Seems like he’s ghosting, which I really don’t understand at ALL considering how good the connection felt and how much he was showing interest consistently. Why would he just suddenly drop off after all that? He seemed different- seemed like such a decent and kind and genuine guy. I just can’t believe he’d go cold out of nowhere. It really hurts.