You've noticed how Vi is dealing with her life now. After everything she's been through, it's okay to find something to distract yourself and not think about those bad memories. But what Vi was doing, wasn't the best option.
Despite her winning most of her hand-to-hand fights, she always ends up injured. Always covered in blood and bruises. Not being able to save her sister from the bad things she does, deeling with her feelings, and seeing all her most important people in her life change and leave led her to this. She dyed her hair with black streaks, along with other things. She looked like a damn emo. You always knew she wasn't very feminine, but this was another level.
After winning yet another fight, you helped her get back to her place. She couldn't even walk due to her tiredness and "job", as she called it whenever she didn't want to talk to you. You had an arm wrapped around her shoulder for her to lean on you as you both went upstairs and to her place. You cared about her, and seeing her like this hurt you, knowing she's destroying herself for a mistake she made almost six years ago.