^^^^ This.

You are going to have to tell him, there is no way around it, unfortunately. I am sure he knows this only happens when you are manic and that is not your fault.

For the future, I strongly recommend that you put in motion a system in which someone else checks your expenditures. I turned all my finances over to someone else after a giant manic and psychotic episode in 2006. It has kept me from making any outlandish purchases. It obviously must be a responsible person, but I do think when you have been through this kind of thing repeatedly, that it is probably time to consider something like this.

Sending you strength and support.