OP, there are a lot of reasons why those who have been previously abused/assaulted are more likely to fall victim again.
The first and probably most common is that after the first time we experience abuse/assault, we are not supported. We are told, or tell ourselves, that our feelings are meaningless, that we invited the attack, that we are disgusting victims, that we were "asking for it". The lack of self-worth that this leads to can end up with us getting into relationships with abusive men, because we don't believe we deserve any better.
Secondly, we are more likely to be paralysed with fear by abusive behaviour, and far more unlikely to fight back or to run. Our brains are complicated, and when there has been a trauma in the past, it can do some really strange things to the thought processes. Sometimes we go into survival mode and the brain just overrides everything and basically says "Don't fight, just go with it because he might kill you."
I would very much recommend reading The Gift of Fear which can help you start trusting your intuition and look for those hidden signals and react in a positive way (e.g. by walking away or calling for help without that fear paralysis.)