Lady Emz is right

if you drop a healer on the weakend party, they will only try to initiate a relationship

the only way to get the weakend villager healthy again is to let them eat

i would suggest putting them on farming (they can get hurt by researching or by building) and to make sure they eat frequently

over time the villager will get healthier

(provided the weakend state is not due to old age)
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Why is it that if someone tells you that there are 1 billion stars in the universe you will believe them,
but if they tell you a wall has wet paint you will have to touch it to be sure?