Welcome, Delljoy! I'm sorry you find yourself in this predicament.
These are serious illnesses that affect mood and cognition. What do you know of how your friend is being treated? Is he receiving any treatment?
Of possible help from the PsychCentral Blogs:
Being Married to a Person with Depression or Bipolar: 6 Survival Tips by Therese Borchard
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My dog
mastered the "fetch" command. He would communicate he wanted something, and I would fetch it.