To me
Willow has a hard time befriending people because of how she looks and the way she acts,
It seems that she gets easily mad (like Bakugo from that anime), sometimes she gets too mad and becomes aggressive with the people she cares of, physically hurting them in the process, causing that one to hurt, realizing that the one she cares of is "damage" (idk I used damage in this line.)
The way she acts could be from the loneliness she has, someone mentally or physically (but mainly mental) hurting her, or it be could something totally different and I am way too off