What it actually means
He saw your message, read it, and chose to reply to something else first. It's not 'he didn't have time' — it's that you weren't the priority right then. That doesn't necessarily mean he doesn't care, but it does mean something else was more urgent or more interesting in that moment.
The 4 real scenarios
1) He's deep in another conversation (50% of cases). 2) He's thinking what to write back because your message needs a real answer. 3) He's leaving you on read on purpose to create distance or play games. 4) He doesn't want to reply but won't say it.
The worst thing you can do
Sending a second message like 'hello?', 'seriously?', or a nervous meme. That confirms you're watching and gives his silence power. The rule is simple: one message, then wait. If he doesn't reply in 24-48h, the conversation closed itself.
How to get your peace back
Mute his chat for the day. Put the phone down for 2 hours. Remember this: 'online' is incomplete data — you don't know if he's replying to his boss, his mom, or a crisis. Building stories in your head from incomplete data is the fastest way to hurt yourself.