Or he may have a wife in a lunatic asylum who is likely to live for the next forty years.

What then?
Will Sara never marry if--if there were a circumstance like that--a really insurmountable obstacle ?" "No, I don't believe she will.

I don't think she would wish to.

If he loves her and she him, spiritually they would be bound to one another--lovers.

And just the circumstance of his being tied to another woman would make no difference to Sara's point of view.