Like, what the hell did I do to deserve that? I don’t know why I let it even bother me because of how obviously immature he is being.
Odds are that you did nothing. He’s clearly an emotional vulture, he probably does it towards everyone around him.
I don’t recommend framing it as immaturity, as it might give you the false hope that he’ll “grow up” and get better over time. Perhaps he gets better, but odds are that he won’t.
Screw this masochistic shit. When you turn the other face you are not saying “I’m better than him”; you’re saying “he’s right in treating me as trash, as I am trash”. You want to ruin his life and make him regret existing.
So, here’s what I’d do:
Document every single time that he contacts you, including the contents. Record calls, save e-mails, take screenshots.
He’s likely doing this with other people too, contact them. Former friends and any ex-SO are a good start. Ideally they should do the same as you (document it) and you should act in unison. Do not let him notice that you’re acting together though, be as stealthy as possible.
I couldn’t take it anymore, so I blocked him on everything I could think of. […] This quote was a part of what he commented on my Instagram picture of one of my tools yesterday:
That’s actually great for you. It means that he kept contacting you after showed clear desire to not be contacted further. Depending on the local laws this gives you grounds for legal action.
And since the guy is a fucking idiot flaunting the fact that he’s an engineer, you might also contact his business. Be polite towards them, but highlight the fact that one of their employees is harassing you. Even if he doesn’t get fired, it’ll put him in a poor position later on.
He deserves to be put in his place. I don’t know if that’s possible though without me becoming just as petty as he is.
The difference between “being petty” and “standing your ground” is why. You are in a position to screw him up without being petty.
You’ll also want to ruin the psychological “kick” that he gets from harassing you. Ignoring him on the surface (while documenting it) is a good approach, because he’ll feel unsatisfied but he’ll try a bit harder.
Also shield yourself psychologically. Remember - you are not the problem, he is the problem.
Vengeance is not a dish to be served cold. You warm it in the blood of your enemies.