Which country are you in? Do you live with your parents or alone?

If you have your own address and are in the States, a lot of people here can guide you in the process of obtaining a restraining order against him. However, if you live with your parents, it would be tricky to conceal the process of obtaining a restraining order from them since the correspondence from the court would need to be sent to their address. Conceivably, you can rent a P.O.Box from the post office and have correspondence from the court sent there - then you can do the restraining order while living with the parents and without their knowledge (but it would cost some money to rent the P.O.Box and you would need to find time to go get your mail regularly).

Whatever the ex is saying by way of threatening to ruin your married life does not make sense and the threats are empty. You are not getting married yet; there is nobody to whom he would send the videos. Even if there were a fiance in your life, seeing your pictures with the ex would not ruin the relationship. Most likely, by the time you are ready to be married, the internet would be one big dumpster of various pictures and videos that disgruntled boyfriends have posted, and nobody would take any interest in that dumpster. Please realize that you FEEL alone, FEEL threatened, etc., but in reality just as you were typing up your post, another gal in a very similar position was typing up a similar post asking for help, and another, and another - your situation is not unique, but typical. Very clearly, these is no good reason to harm yourself and much less so, kill yourself. Your situation is unpleasant, but typical - a disgruntled ex making angry but empty threats. Please get a perspective and some distance from the situation. Unless he has a history of physical violence towards you, he is just *****ing.

Also, you are worried that the parents would get a heart attack. For one, it is unlikely. For another, when you want to kill yourself and are not seeking out the help of the parents for fear of their getting heart attacks, you are valuing your life lower than their health. But look at this from that angle - suppose you have killed yourself. Would they then not get heart attacks? What is more likely to cause heart attacks in them - losing you forever or learning that some dude cannot take "no" for an answer?

If you can ask the management to gently reprimand him without firing him, that would be best, but I am not sure you are mature enough to navigate that terrain and strike the rather delicate balance between having your needs for safety met without ousting ex from your office.

Right now the main problem that you seem to be having is "tunnel vision". It is understandable that a young woman in your situation, trying to please everyone, would feel that she is at the end of her rope. But if you look at your situation from the vantage point of a bystander, you will see that you are not at the end of your rope and that you have some power over the abusive ex.