My ex stalks me, he gets new emails when he feels he's been blocked and sends me messages saying he misses me and how it sucks for him. Sometimes he hits up my parents too just to try to isolate me from my family.
He finds my accounts online to the point I use fake names everywhere because he won't leave me alone.
My friends had to block him everywhere because he would use them to snoop on me through them as well as dealing with threats and demands as well as manipulation. I have even heard reports of him having visited dating profiles where visits are reported, absolute nutcase.
Had to change my phone number, my close friends had to change theirs too, or our voicemail would be full of whining, blackmailing, threats and nonsense.
Even after getting a restraining order, it seemed to translate to us having a long distance relationship for him, as he would ignore it until I pressed charges.
Before I had left him, I would often catch him having forgotten to delete his history or previously opened files and programs.
I found that he had been recording me in my own house for many hours out of my daily life, as well as trying to use my cellphone to track my location if I happened to be out with a friend without him.
It's rather disturbing at what length stalkers are willing to go.
I would recommend a restraining order, save all the proof you have for it.
This will usually prompt them into stalking in a more incognito fashion if they're completely obsessed, but it only takes a single mistake and then you can press charges at the very least.