My exabf tried that as well... a day or so after I put my dog to sleep. He attached a message that said "thin we could both use a friend right now, what do you say?"
It was difficult for me to resist writing back, "i have plenty of friends already, I don't need you to be one of them" I just ignored it. I don't know if it was keeping tabs, but it was definitely another way to keep contact of some sort. I'm glad you didn't fall for it.
Have a great week!