When your ex left you for someone else and comes back for a chance?

Of friendship... Or friends with benefits.. Or whatever he can get.. Why is he doing this now when he left me for someone else in the first place? Bc she left him. or he's done with her? He wants to start with good vibes and not analyse things but go with the flow... Your thoughts, what does he really want and why now? When he left me after 3 months of break up.
When your ex left you for someone else and comes back for a chance?
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