I obviously don't speak for everyone diagnosed with both- but I really have to disagree on this one.

At some level and for at least some point of time, you understand what you are doing is wrong. At a certain point you may cease to have that insight. Again, by all the logic presented, the new phone [and therefore need for secrecy] makes little sense. So I have to suggest there was some knowledge of wrongdoing here- even if he feels very very guilty.

How to deal with these events, how to process them? It's not up to anyone but the OP and the spouse.
However, I would suggest not eschewing any responsibility from here forward in any way on anyone's part.

You both know what you are dealing with now. [Whether it is a diagnosed mood disorder, a hypersensitivity to stimulants... or the infamous "Door Number Three"]
Fool me once... right?