You remember that everything you like that they do they learned from their past. So be happy they learned it.
And if you’re worried about unfair, unkind, or unfavorable comparisons, make yourself the best they ever had. It might take time. But you’re not a quitter, are you?
Yeah, retroactive jealousy is a bitch. Especially when you’re young and relatively inexperienced. Just remember that if anyone in their past was worth their salt, they’d still be with them. They’re with you now. So focus on the now. The past is gone. Let it go.