How long did it take you to move on from your first long-term breakup?

One of my old friends (we aren't friends now)
Broke up with his girlfriend and his girlfriend is one of my favourite people, she helped me to get a good job.
I flew to UK.
So I can't do much as I am out of country.
I kinda feel bad for her.
I want her to move on because the guy moved to another girl within a 2 months.
How long did it take you to move on from your first long-term breakup?
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