I went out with my boyfriend and his coworker. I tried to talk to her, but was ignored the entire night and she took all of my boyfriend's attention. So I moved to the side and did my own thing, then later she texted him that she wanted to have sex with him and other explicit things. He responded with a thanks, but no thanks, don't want to ruin what they have. My question is about his coworker, who is older and more professional than me. Next time I go out with my boyfriend and his friends and she's the one there can I just give her the cold shoulder? I can't be like "girl back the f off my man" because they both work the same position and have to see each other every day. That, and I'm way too shy. Is there a way for me to tell my boyfriend 'I'm going to go do my own thing, have fun and if you want to join me don't bring her?"