Yesterday I told him I would stop nagging him. He told me not to stop, that he plans to go but is just lazy. Sigh... I'll bring it up again maybe when he finishes his current semester, toward the end of May.

To explain exactly why I get angry, I'd have to explain too many details about our professional situation. But anyway, at least I talked to him and managed to figure out that he does want to go but the timing needs to be right, and I also figured out why I'm so irritated about it, even though I can't write about it so openly here. Thanks everyone for your feedback.