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either to get a reaction from you or to make sure you got the message and move on too!1
To get a reaction out of you..
If they need to tell you they have moved on, they haven't at all...
If you have moved on, you wouldn't even waste your time to let them know tbh
My guess would be that it took them a long time to get over the person and by letting them know they are getting a sense of closure (feeling more finalized in a way) :) I had a guy do the exact same thing but I guess everyone moves on in their own ways :) Usually for me I sulk for a week or two (even if I'm the one who initiated the breakup, lol). It doesn't feel good regardless and usually I end up staying friends with my exes but I'm not ready to move on until a few months (I have no idea why) lol :)