Id stay the fuck away from that guy. He's definitely stalking his ex. And may want to use the same methods on you now, for whatever reason.
He hasn't done anything that would warrant any legal action. Being a dick and having a friend try and friend you on Facebook isn't a crime.
Still. Stay the fuck away from him.
my 2ct.
Oh, and yeah.. you had someone else write him? Is this a habit of you and your friends? that confused me a bit.