Does he like me too, or is it all in my head?

I dont think its in your head! I think you two may have had something going... but perhaps when you stopped talking so much he might have been a little disapointed. Maybe he thought you didn't like him. Maybe thats why he hasn't made an effort to talk to you much. So he might transfer because he think you dont like him..and he should move on. If you like this guy enough maybe you should talk a little bit again... who cares what people think! I dont know. its up to you! Good luck!