Why is my ex who I broke up with nearly six years ago trying to mess with my new relationship?

An ex who I broke up with six years ago and is part of the same friend group is annoyed that I don’t want to hang around with them and only my other friends within the group.

admittedly I should have cut all contact but I thought we could be civil and I backed off to give them time to heal but they are now sending passive aggressive “jokes” directly to me involving my current boyfriend, why are they still hanging on and what can I do about this?

Why is my ex who I broke up with nearly six years ago trying to mess with my new relationship?
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