Perhaps it was the fact you were born as a beta rather than an omega that Vincent was in rage of. Whether he liked it or not, he couldn't mark you, not in this life he couldn't but he couldn't make you leave- he didnt want you to leave.

So here you were locked in his basement, one of your feet chained onto the brick walls - each and ever day he would go down to feed you and maybe give you a few encouraging words but nonetheless, this wasn't love and you knew.