Ex boyfriend

This happened about 4-5 years ago when I was around the age of 13.I live with my mom and dad and two of my sisters and the oldest one out of all of us lives with her husband.We live in a small town in CA.This story is about my sister who comes before me in line.She was in college at the time and was only 19 years old and met a guy there who I will call James in this story.James was a tall guy about 5'9 and was a bit chunky I guess you could say while my sister was only about 5'5 and thin.When they first started dating he was very sweet and always had a gift for her or our mom whenever he would come by the house to study or visit my sister.The only thing our mom was worried about was if his parents would approve of him dating my sister because we were from different religions but other than that our mom really liked James and so did my little sister and I.Then everything started to change as they went on in their relationship.My sister told me how we was a bit obsessive and jealous when other guys looked or talked to her and sometimes they would get into arguments where my sister wouldn't talk to him and he would spam her phone asking her to forgive him.I remember one specific time when my sister and James had gotten in an argument again and she had broken up with him.That night I woke up to my sister crying talking on the phone (since we shared a room) talking to James.I was confused and worried and asked her what was wrong but she just told me she would talk to me in the morning and I went back to sleep.The next morning I asked her why she had been crying on the phone and she told me that James had called her while driving telling her that if she didn't take him back he would drive his car off a bridge.My sister was telling him to think about his mom and to not do anything stupid and eventually ended up taking him back.After that I didn't like James and my sister was trying to find a way out of that relationship because she knew that it was toxic.When she finally did break up with him James got very angry and started the same thing over of spamming her phone but this time my sister ignored it.One day when the three of us were home alone my sister told me to make sure the doors were locked and to shut all the blinds.I was confused and kind of scared because she said it out of nowhere so I did as she said and asked her what was wrong and she said that James has just sent her a message telling her that he was going to drive to our house and take her with him.My heart dropped and we were really scared that he would actually attempt anything to hurt my sister,but thankfully he was just bluffing to get her to take him back and after that my sister blocked him on everything and that was the last we ever heard of him.Now my sister lives with her fiancé whom she has been with for about 2 years who treats her well.To this day I think of what has become of James and I hope he never attempts to come by our house ever again.

Has anything similar ever happened to you or someone you know?.