You were working for Slade. He saved you from your abusive father when you were ten. Since then he's helped you, trained you to became stronger (figuratively) than any man and make sure no one could hurt you in such a way again.
He sent you to find Rose and bring her back to him. It didn't take long to find out she was with Titans 2.0. It also wasn't hard to get past their security.
You didn't get far however as Rachel could feel your presence. She could also read your mind. Once she show Deathstroke it triggered her anger and released her inner demon.
"I don't think that's a very good idea"