My best friend and best guyfriend

My best friend recently told me she has feelings for my best guyfriend, who has feelings for her... And i know I should be happy for them and everything.. But I don't want them to start something and then forget all about me. I love tyhem both, and they both mean the world to me. So I don't want any wrecked relationships because of this. And I am NOT jealous, infact I have a boyfriend, who I really like, and that's why this is bugging me, I don't know what my problem is.... Please help!!!!!