this might be a stupid question but why is it that when i try and heal some one they always end up breeding

Villagers can be healed only when their status shows "Sick" on the Details Screen. Villagers who are "Weakened" cannot be healed by other villagers, and attempts to heal them will initate a breeding attempt. Villagers can become weakened for a variety of reasons, including old age, extended illness, animal attacks, and strenuous occupations. The only thing that can be done to help them is to put them on less strenuous duties. Farming and medicine seem to be less hazardous occupations than building and research. Alas, for the elderly, even light duty may not prolong their life by much. Researching higher levels of medical technology does extend their lives significantly.

thank you, i will put them on lighter tasks.