<human>: I just recently accepted a new job in the IT field I have been trying to get into ever since I finished school. I am really excited and cannot wait to start in two weeks. I have already started to fill out the necessary paper work that needs to be done for the job.

For details, I am 25/M and have been with my girlfriend 26/F for about three years now. Everything is going famtastic on that front.

Now today I get a phone call from a mysterious number. I answer it and it is my girlfriends exboyfriend. Mind you, I have never talkedn met or have any clue what went on between him and my crurrent girlfriend. He informs me who he is and that he works at the company I got accepted at as a manager position. He goes on to tell me how he would like for me to "step away from the position" and how he "doesn't want to see me there to be honest". Now I have to say he was rather calm and stable during this phone call. There was no yelling or insults. He did go on about how he is sure "you're a nice guy and all" but he just does not want me to work there or see me. He was suggesting I renig on the offer letter I got and insisted he has connections to help me get a job in the industry elsewhere.

I mean, I have never once talked to this guy and neither has my girlfriend (I already talked to her about this). How should I handle this situation? Should I tell HR? I mean, howd he get my contact infortmation? When I look online I can see who my manager is for the position and it is certainly not him. Should I just go to the job and leave this be? Any advice would be nice!

Can you give me a shortened version of the text?
<bot>: My girlfriends ex works at the company I got a job at. Tried to coerce and almost threatened me to not accept the job. What should I do?