Re: HIV
I agree with Psyah and Picocio. This is not about love but the reality which both the spouses have to deal with.
Both should separate with dignity. Even the wife cannot take care of him indefinitely, sooner or later he will be in a worse condition. Until that point the wife possibly could be with him but there will come a certain juncture at which there will be little options. Even if they stay married the wife is destined to be a widow sooner or later. Some of life's realities are harsh and difficult to accept.
The husband should explain the truth to the parents and let his wife go without any objections. The only thing I wish is our jahil society would realize such problems and treat them with dignity as well and put no blame on the wife here and make it easy for her to remarry.