Maybe you should focus less about trying to make people your closest buddy in the world and instead pay attention to your surroundings and environment. No one in their right mind wants to just bare all their secrets to another individual they have no trust of, no matter how many times you berate them to do so.
MC: Are you going to keep acting cold?
Girl: Yes, I don't know or trust you
MC: AHA so you admit it!
Girl:...Yes, I don't KNOW or TRUST YOU
MC: Why don't you just give up, let go of that burden, and give in to accepting me
Girl: MUTHERFU-
MC: She's obviously brainwashed
Me: Or just a normal person, not everyone just relays their entire back story at a heart beat and explains how their gears tic. That is earned, not prodded. And if you want to know so badly, just make her say it. If you want her to do so of her own volition, than start by respecting her privacy. Speaking of which, this master slave contract makes no goddamn sense. Who in their right mind purchases a slave with rights that isn't a bound slave.