Is it a red flag if a person still has their ex in their profile picture?

I've been talking to a guy and his profile picture is a group picture with 5 people in, including him and his ex. Is this a red flag? He hasn't spoken to his ex since they broke up 3 years ago and doesn't use social media that much but I don't get why he wouldn't have changed his picture?

Is it a red flag if a person still has their ex in their profile picture?
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