I know I'm probably BU but ill give context
DS is 16, he was in a relationship with a boy for a few months, after they broke up their relationship was very on and off which I think is normal for teenagers (it was years ago anyway), DS is autistic and got very fixated on this boy, when he's had friends over I've heard them telling him not to give him more chances and he can do better etc.
One of his friends has told me she's worried about him as ex blocked him, DS doesn't think he'll get unblocked this time and seemed fine for a while and kept telling them all he hated him. However, he's recently got it into his head ex is in a new relationship and seems to be really obsessed with finding out if they are in a relationship or just friends, which obviously doesn't concern him, he's done a lot of social media stalking and hasn't found his answer but has asked his friends to help, they've not agreed but they reminded him that he hates him, DS still says he hates him but if he finds out they're in a relationship it'll make him stop waiting for ex to talk to him again and to move on (I do feel a bit sad for ds there as it was his first proper relationship).
DS doesn't seem to think anything's wrong as he's not contacting him, or his friends but obviously if ex found out he could possibly get in trouble for harrassment?
I was wondering if id be U to threaten him with the police to make him stop doing this, as it might scare him?