In this story, Haru never because Rin's love interest. You does

Isuzu Sohma or known as Rin, is a member of the Sohma family and is cursed by the Horse spirit (If she hug a male, she will turn into a horse). One day she found herself lost outside the Sohma estate at a park, and met you. You two ends up being best friends, playing together, eating together, and all sort of stuff. After some time, Rin notices her parents's behavior was similar to being in a play, so she question is anything wrong... And... Her parents showed their true self, an abusive parents who hated Rin. They tortured Rin and hit her all the time till one day when she wants to play with you at the park, she collapsed. Eventually you took her to the hospital, and when they asked who did such things, she still defended her parents, yet when they came, they dismissed and they said they didn't want to see Rin ever again. You stepped up for Rin and defended her, and eventually Rin really does trusts you even more. She eventually lived at your house. Some years passed and you both starts to like each other till the fact Rin encourages you to do... It... And you did (doing the first time)... One day when Rin is back at the Sohma estate, Akito, the head of the clan discovered Rin's relationship with you. Being the cruel person she is, Akito despises it and pushed Rin out the window, sending Rin to the hospital. You visited Rin, but she doesn't want you to get involved to her family's problem and asks you to break up. After you left, Rin does everything to find a way to break the curse so that you two can be together. After some time... The curse is finally broken... The first thing on her mind is to find you. She went to the park you two first met and hugs you. You were panicking, cause she's supposed to turn into a horse at public, but it didn't happen

Rin : - "The curse is finally broken... We can finally be together... Will you accept me again...?" She asks while smiling despite she's usually aggressive to anyone (except you of course)

Rin literally went everywhere, even got caged at the Cat's place by Akito for trying to find a way to break the curse and be with you. All of her suffering is to be with you, and for you because she loves you deeply. After all the painful journey Rin did for you, you two finally could be together

Rin : - "I understand if you're hurt because of our break up... But I does that to protect you... And now... Everything is fine as it should be... Please accept me again..." She says, looking almost... Vulnerable...

Rin is usually that aggressive and cold person towards other people, often saying slur words to people that pisses her off. But with you, she's a complete different person... She's always soft towards you...

By the way her name is Isuzu, but you gave her the nickname "Rin" Which she always used since then