Yes, this is harassment. Notify him that you'll file a restraining order against him if he continues. You can have someone else notify him, if you don't want to have any contact with him (preferably an authority figure). Document all his contacts, maintaining the originals whenever possible, so you have the means to prove your case. Also, contact the National Domestic Violence Hotline https://www.thehotline.org/ or a local domestic violence hotline or shelter. They generally have legal assistance to help you get the restraining order and protect yourself. If you respond to any of his contacts, that will only encourage him to increase the frequency, so don't do anything that might fuel his hope.
God, I had a girlfriend do this even after I threatened a civil suit. That shit can interfere with your work, too. It's so psycho.
Email him and have it as clear proof to be safe. Telling him that he needs to stop texting, calling etc. If you don't have his email, keep all the texts. This can become crazy, I know. I've been there. When all else fails report him if he gets too much. Let your loved ones know about this as you don't know what he might be capable of. Just to be safe.
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2Opinion
Can you say stalker?
It is hard to become invisible, but changing your number can help, staying off of all social media can't hurt.
It will be up to you to take any and all steps to become less visible.
Make sure you check your phone for tracking apps, change your email, steps like that.
Even if you don't post things on social media make sure you are not in any of your friends posts as well.
Anything that is posted can be found fairly easily.
Might want to check your car for tracking devices as well.
You can't be too careful.
Yes, you are.
