omg you poor man, i wouldn't wish a wife like that on my worst enemy, you were so patient and caring and tried to do right by her. she in turn acted horrendously, nobody deserves that. Kudos on getting the courage to leave her it was probably the wisest thing you have ever done, i can't fathom how evil it is to have her lover come stay with you, have sex with him (loudly) and expect you to pay for it. i really felt like i was gonna throw up reading that, my heart goes out to you man, i know what psychosis and depression feel like and to deal with all that too omg.
As far as i know the true cause for your episode may be depression related, as was my experience, i personally feel (and take this with a grain of salt my friend) that the underlying issue is not cause by the situation but it exists of its own accord but the horrible, horrible situation that woman put you through would leave anybody horribly depressed and (for me at least) deep depressive episodes trigger psychosis for me.
So i guess you could say she triggered it in a sense but i think it may have already been there.
please know the world needs more people like you, patient, caring and self reflective.
Stay strong and if possible try to get back to the pdoc's and on whatever meds you need.
just remember you were awfully wronged and cheated on and none of it was your fault.
I hope you can find some peace in your heart and find someone deserving of your good nature.