Yea that was a bit of a low blow trying to imply that his pursuit will somehow hurt her and making the assumption that she definitely wants to reject him. He's essentially trying to deny his opportunity to express those feelings while trying to manipulate them by saying if he cares he should back off. Its one thing if her life truly had been negatively impacted by him, such as bringing her into contact with dangerous people, but clearly that's not the case here. He's just trying to psych him out rather than challenge him directly. Lin Hao thankfully made the good counter that he isn't the one who gets to decide for Anran what's good for her. Moreover, the doctor is presuming he won't hurt her by his pursuit? Double standard there.