As you can guess the colleague is still in college and is 23 years old. He's a kid and I forgive him for that. He's very vitrolic about me because manager likes me and it can be seen that he likes me. He''s not doing anything bad to others because he likes me. I am male, manager is male, and this vitrolic dude is making me emotionally sad day per day, and I am falling into his trap.

I don't want to contact HR because I know they'll probably fire me when time comes because they love mediocre employees as they can pay less salary to them.