A man marries a woman in her mid-30s, and...

After living together and trying to adjust, if they experience frequent arguments due to personality differences and severe stress, and the man decides to break up while the woman is in her late 30s without children,
is he a bad person for making her miss her window for childbirth?
Or, in cases like this, is it not necessarily the man's fault, since the constant friction made him lose confidence in his ability to have children and maintain the relationship??