If you let your guard down in a relationship is that most likely to lead to abuse?

I wasn’t very trusting of people before the relationship and I thought she was different so I completely dropped my guard and made myself vulnerable and then the abuse started her favorite names for me were nuisance and bitch. She would also physically hit me, one time I was petting our dog and she hauled off and knee me from behind

If you let your guard down in a relationship is that most likely to lead to abuse?
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