<human>: Hi reddit!

I'm using a throwaway account because my BF is on reddit, and knows my usual username.

He and I have been dating for roughly 6 months, and several weeks after we met, one of his female friends told him that she had strong feelings for him, and was a bit pushy when he told her that he was dating me. For clarification, she already knew about me before the great revelation, and this did not deter her. He was initially upset with her, and avoided her for a while, but has since gone back to spending time with her on a fairly regular basis. 

I have not really been in this position before, and don't know if I'm feeling jealous, or if I'm right to feel uncomfortable with their interaction. I know that he didn't necessarily do anything wrong, but I don't like that he continues to spend time with her when she was so obviously disrespectful of me and our relationship. They work together, so I don't mind if they're friendly at work, and attend the same professional functions, but I want to know if I'm justified in feeling as though it's inappropriate for them to hang out alone (in my absence) outside of work, when it's really personal choice. 

Help!

Summarize the given text in a few sentences.
<bot>: BF's platonic female friend came onto him despite knowing about our relationship, and he has continued to spend time with her outside of work. Am I being unreasonable for being uncomfortable with this?