Re: illness
It doesn’t matter whether it’s an illness or anything else that you would usually not disclose to the whole world: When you start the process towards a husband-wife relationship, the single most important factor is:
Absolute honesty and openness. There should be no deceiving or hiding anything from each other. In a relationship that is as close as that of husband and wife, the truth will come out eventually at some point, even if you are trying to hide it.