Summer, I agree that you at least need to tell your pdoc that you're still having symptoms of mania. You don't have to tell them about having sex with another patient in the hospital. But I think you should tell them about what you did at your therapist's. Or at the very least, say that you're having sexual impulses and having difficulty in controlling them.

It's good your T held the boundary I guess?...but I think he also should have insisted you talk to pdoc and/or possibly go to the hospital. I'm not saying that to judge you, but you aren't in a safe state of mind.

I also worry about how you felt with him rejecting you in that situation. As I imagine that was very painful, especially with his sending you such mixed signals. Are you OK right now? Are you safe? Please check in when you can.