I don't know your situation fully, but based on what you've been saying you give the impression that he says he'll do things and doesn't live up to them. Is this a fair analysis? And if there's a focus on "hanging out after school" it could well imply that he's only interested in fingering you behind the bike shed (you know, just wants to be physical with you.)
If you're into that then that's fine.
But don't let him play you if that's a risk in any way.