Oh man, I feel sorry for Hoshino. That day that Eiji helped her was very memorable, but people still treated her badly after this. So she just bitterly accepted the hate and became a different person. She accepted money to start breaking people's hearts, because people thought she broke them anyway.
But Eiji and Aoi showed her so much kindness, it was hard for her to continue doing so. I hope that she accepts Aoi's relationship with Eiji, but if she continues to be a rival, oh well.
Looks like there's trouble for Shigeru though! Aoi won't ever accept you, and with what you're doing, you'll just end up abusing her and Eiji's kindness. It's time to stop!