I wouldn't say it's much different than dating based on looks either. I wouldn't knock someone who wouldn't date someone with a disablility if they couldn't handle the dependancy as it would be better in the long run for both parties to be in a relationship they would be completly happy with rather than someone who can admit they can't handle it putting up a front for those who would look down on them for not doing so.
As far as leaving somone for a disability come upon during a relationship, In marriage the lines "in sickness or in health" are said and anyone breaking that bond is pretty fucked up.
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