How to confront my coworker after I rejected him?
My coworker came back to work after his shift ended while I was closing alone and asked me to drinks and dinner and I said no. It’s very obvious he likes me and I’m not in the slightest interested in him at all. I treat everyone at work the same. I’ve also never ran into this issue.
He had asked me about my weekend last week and I very intentionally brought up how I’m seeing this man, we are dating, and things have been going well. He has been EXTREMELY cold to me ever since. Working in a different office, falling asleep at his desk, rude and condescending when I ask him for help, I have to repeat myself 2-3 times because he ignores me. It’s so obvious it’s starting to scare me. While my manager was away, he had asked me to watch a movie with him in this dark conference room alone and I said no I’m going to get lunch. So many instances of him borderline harassing me and showing me interest and I keep having to reject him. It’s very annoying and stressful - I would ideally like to continue this job through grad school and move up in the company.
He claims his attitude is due to “keto flu” but I can tell he’s extremely immature and that’s obviously a lie. I’ve spoken to my manager but I don’t think he gets it. How should I confront this coworker of mine directly?