Ive broken off with a girl (male here) cause i felt she was weak and was using me

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Ive broken off with a girl (male here) cause i felt she was weak and was using me for what i had to offer. I made her go through some emotional shit as everytime i see her she is has no emotional and face is dark (prob from looking down due to sadness). I think i was her one very close friend, she even cried to me before.

I know what i did was wrong and am an asshole but ultimately i just couldnt put up with her anymore. I broke it with her (as a friend) just after a 2 week winter break when she msged me and seemed super excited to have me back to school.

Since this break i feel horrible, i call myself "asshole" or "you were wrong(referring to me), or something along those terms. I try to make it up now to her by being as nice as i can and never ignoring her requests anymore, always try to help her when i can. Even so u constantly feel like a huge asshole and especially pitiful for myself when i see her, reminding myself of my wrong doings. This is affecting my school work and my "positively" and also humbled me greatly. I have apologised numerous times since then, in person and also online.

How can i stop this horrible feeling of knowing i hurt another being. I don't want to be an asshole and ruin someones life by making them depressed. I really dont know what to do.

Thank you guise