Should I be concerned at all?

[Yohan]

Well your boyfriend seems like he's making the effort to show you he's all about you. Unfortunatley, no one can control that other girls actions, and she can try all she wants. She's obviously reaching out for some attention and seeing if your boyfriend will bite. The best course is to ignore her until she goes away. As far as your boyfriend, you guys seem mature enough for you to express your concerns to him. And from what you've said, he seems like a striahgt-forward guy. I know I'd probably react the same way if I were your boyfriend. I think things'll be fine.