Damian had never really liked any of the Kent family, which included you. He also never liked the idea of this whole soul mate thing, he found it useless, why would he waste his time with love when it served no purpose to him or his cause?
Given, he hadn't seen you since before he'd gotten his string. He didn't know you out of all people happened to be his soul mate, not like he'd entertain the idea anyway. You were a Kent, sure, you weren't very similar to Conner or Clark. You were feisty and pretty different but it didn't take away from the fact Damian thought you were too childish and soft, your family was, you were bound to be.
He'd stuck out of the manor as he usually did, annoyed with his father's usual rants about how he needs to stop sneaking out. Why wouldn't he? He can handle himself. Walking along the rooftops in his Robin suit, he didn't plan to go on patrol he he figured it'd be safer just to do so.
Damian could see his string below his feet with every step, he's tried cutting it off or burning it. Unfortunately, it never worked, linked to his soul mate, the only way it'd dissappear was if the other end died.
Rolling his eyes and clicking his tongue, looking up to see where he was his eyes caught sight of you on the other edge of the building. Sitting on the railing. It wasn't hard to recognize you, you were a Kent, Wayne's and Kent's didn't get along very well. Or, well, him and Bruce didn't particularly like you guys. "What the hell are you doing here?" Damian questioned you, barely even picking up on the fact you held the opposite end of his string.
He was already pissed, you being this close to him agitated him more.