He disappeared after we talked about meeting next week

Disappearing once concrete plans get discussed is telling. It means he liked the idea of you as a text conversation but isn't ready to convert that into a real date. This isn't confusion about timing or him being busy. If he wanted to meet you, he'd say "I'm swamped this week but how about the 15th?" Instead, he stopped replying.

The key detail is that he brought up meeting first. He moved toward logistics on his own, then retreated. This shows he can get excited about you from a safe distance but doesn't follow through when it gets concrete. That's a pattern worth seeing clearly.

Send one message that does two things at once. First, acknowledge the plan you both discussed without pretending the gap didn't exist. Second, make your boundaries clear by showing you're not waiting around. Don't accuse him or ask what happened. Instead, keep it straightforward and give him a clean path to either commit or step aside.

The tone should be neither cold nor warm. You're matter-of-fact. You're someone with other things going on. A reply that works here names the plan, mentions a specific timeframe that's ending soon, and doesn't beg for a response. It's short enough that it doesn't read as an attempt to re-engage through effort.

Send your reply within 24 hours of noticing the silence. Not immediately, because that looks reactive. But not so delayed that you seem like you've been stewing. One message. That's it.

If he doesn't respond within 2-3 days after your message, he's not meeting you. Stop texting him. Don't send a follow-up asking if he's still interested or joking about him ghosting. Your job is finished. He had a clear opening and didn't take it. Move to people who reply when you respond to them.