It doesn't matter if someone is whatever we think of as strong or not. Abuse usually comes out of the blue; in a position where it is sustained (marriage, family, the workplace) it can and does crack even the strongest person, men as well as women. And very often it comes from someone in a position of power (doctor, priest, boss) or someone who is able to manipulate themselves into a position of control (partner, parent, relative, friend).
And very often it comes from people in a position of trust - see above - which means that it is so hard to stay strong when trust in those who are supposed to look after people has gone.