Thank you PeaceLoveJes for taking the time to give me your advice. It is now nearly 3 weeks and neither of us has heard from her, but this has resulted in my having no choice but to try let the situation go. I suppose the fact that I have not had the opportunity to speak to her (not by choice) has allowed my anger to subside a bit and see the bigger picture.
I agree that letting your anger get the better of you does you no good, and you only hurt yourself by holding resentment.
I will research Thich Nhat Hanh’s books, as I (and my boyfriend) believe it is important to live a peaceful life. I am very thankful that all of my immediate relationships are happy and peaceful and maybe this incident made me appreciate that more. It worries me that unfortunately I will have to see her at future events, including an upcoming wedding, but I suppose the advantage I have is that her parents are totally aware of the situation and that I did nothing wrong, and have been nothing but accepting to me. And I know that worrying will never change any situation’s outcome.