How to stop feelings I git for my ex from 1yr?

We've been together from 2018 to 2021 (nearly 3 years). In the beginning it was flawless.

Then she started to go to university and didn't find time for me (we saw each other once a month). That caused distancing and arguing. She started to get jealous on random girls I didn't even know.

We broke up a year ago, she called me a few times then and cried, wanted to get back. I gave her a chance but she showed me that she isn't ready to change her behaviour and we broke up again.

She is stalking me, asking rendom people questions about me, she is following me around when we meet on the road etc.

I know that I couldnt be together with her now because I dont like her behaviour and I would like to have a normal relationship. She is not the same person as she was at the beginning of our relationship.

I am craving for a person that doesn't exist anymore. How to deal with it? I can't change her nor I am willing to. I got a degree and my bussiness is booming. So I haven't been just sitting around when we broke up.

I think that she is giving me signals that she is there if I want her back but she acts the opposite. But I dont want her as she is now, I want her older version.
How to stop feelings I git for my ex from 1yr?
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