Why is it Ironic that Isaac and Monica break up?

Why is it Ironic that Isaac and Monica break up?: it is Ironic that Isaac and Monica break up because Monica could not handle Isaac loosing his eyesight.

Explanation:

Monica later broke up with Isaac because she could not handle Isaac loosing his eyesight. Throughout the book, Isaac struggles to accept why Monica broke up with him if she was "always" in love with him.

answer; a farmer who refuses to fight in his country's army;