Not intentionally. It's an involved story and I'll try to sum up but he sought your help with a vampire that had been a sorcerer possessed by a demon when turned. Against everyone trying to keep you out of it for your own safety you went to rescue Samuel, Ben and Stefan. Stefan had to feed from you and gave you some of his blood back and that made a connection. Fast forward a few months after you killed the demon-vampire and it's creator, Marsilia found out that you had killed one of her vampires and Stefan had covered it up, and seemingly killed his menagerie and tortured him. It was in his panic or nightmares or whatever it was that his mind gripped yours and I refused to let him have you.