Update: I ended up telling H. I think he could tell something was up, so figured I may as well. He took it as well as could be expected. He definitely wants to discuss it more with MC on Monday, but seems OK with it for now. I think it helps that we in general discussed self-harm in there a few months ago because I was having thoughts about it. So this isn't coming completely out of left field. And he understands that it's not the same as wanting to end things.

Incidentally, my MC wrote back to my e-mail saying he'd had no cancellations and that he didn't want to give much advice but said to just trust myself and my instincts because I've been doing well in dealing with H lately. By the time he'd sent his e-mail, I'd already told H, so I guess MC was right! (It was nice that he wrote back, too, since he often doesn't--but I know to expect that from both him and T).

Feeling better now that it's out...though I'm sure I'll be nervous on Monday. Thanks for reading.