Do most guys get jealous of their ex girlfriend's boyfriend?

Anonymous
Honestly do most guys get jealous of their ex girlfriend's bf? Is this a legit matter where guys have a sense of territorial ownership? aka she was 'my' girl and you get your grimey hands off her type of deal? I feel right now my ex boyfriend is jealous and I'm ignoring him. Do you guys ever feel that way about your past ex's and why?
Do most guys get jealous of their ex girlfriend's boyfriend?
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