That kind of switch can mess with your head, especially when the connection felt good. When sex is great, it’s normal to assume there’s at least some interest after.
The tough part is that sex doesn’t always mean the same thing to both people. Him inviting himself over and then not showing up without explaining is still information, even if it’s quiet and frustrating information.
It doesn’t automatically mean he never wants to see you again. But it does show he’s not being very clear or thoughtful right now.
I wouldn’t assume anything negative about you or the night you shared. If you want, you can send one simple message and see how he responds. Something light. No pressure.
If you don’t hear back, that’s your answer. Not a fun one, but an honest one.