The guy I flirt with act work, has started flirting with someone else and in return I feel like I am left out in the cold. He basically treats her like he used to treat me. So in-return, I have allowed myself to become a little jealous and I don't want to be like that. So in order for me to fight that feeling, I just ignored him all day at work. I don't want to be high school about it, but I need to find a way to teach myself to see him as a friend only. I need to learn how to not care about him talking to her or anyone else. What do I do? Any positive advice will might help.