If maya has got cctv cameras fit all around the house, then what is Arjun afraid of? Because if at all he's blamed of domestic violence, those will be the sheer proof of his innocence!
Why doesn't he publicise the fact that he's constantly under mental pressure, under cctv surveillance and ask the media to hover into their home suddenly and check the footage?
So in all what I mean is when you are under recording, it has certain advantages to prove you innocent if you are. Therefore Arjun not leaving isn't much about him being legally doomed as much as it is about the fact that he knows she's sick and needs help and so he's draining himself yet doing that.
If a man is portrayed this way, the whole concept of manhood changes even for a bit and that's appreciable.