How long will it take to get over my ex-stepmother?

My biological mother left the country when I was little so I haven't seen her in like 15 years. I was sent to boarding school because of the family drama when I was 8 years old and met my former stepmother a year later but like a year before the pandemic she had an affair with her boss and divorced my dad and never talked to me since. I still miss my ex-stepmother.

How long will it take to get over my ex-stepmother?
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