At this point, I would say ignore since you made the mistake of apologizing.
A guy calling you out for PMing his gf/wife is perfectly normal, that's standard mate guarding, but it's usually 'stop talking to my girl' or something similar. 'See you soon' is over the top. Since you already apologized there's no backtracking, just drop it and if this continues call the police,
BUT for next time, after you got the first message I would have called his bluff, something to the tune of:
'Oh look a documented threat. You'll be seeing the police soon too.' And leave it at that.
I have a little respect for a dude doing normal mate guarding (though if he was really all that to her he wouldn't have to in the first place), but if you take it that far you need to stick up for yourself - which you didn't. It's ok, maybe next time.
A guy calling you out for PMing his gf/wife is perfectly normal, that's standard mate guarding, but it's usually 'stop talking to my girl' or something similar. 'See you soon' is over the top. Since you already apologized there's no backtracking, just drop it and if this continues call the police,
BUT for next time, after you got the first message I would have called his bluff, something to the tune of:
'Oh look a documented threat. You'll be seeing the police soon too.' And leave it at that.
I have a little respect for a dude doing normal mate guarding (though if he was really all that to her he wouldn't have to in the first place), but if you take it that far you need to stick up for yourself - which you didn't. It's ok, maybe next time.