The simple reason why Komi would always win from Kawai:
Komi accepts,Kawai rejects.
Komi accepts Tadano how he is,Kawai wanted him to change.
Komi accepted the help from her friends, Kawai rejected the help from her friends.
Tadano-kuns gift is amazing: he knew Kawai was pushing herself. Can you blame him wanting to be her hero when he was in love with her?
Honestly, I don't feel sorry for Kawai. Asking someone to change is never a good idea,no matter the relationship.
Yet,Komi and Tadano will probably help her with her friends. If I was Komi, I would just leave her alone lol.