My (Ex gf) best friend has told me she has feelings for me while she is in a relationship. I told her I still liked her too but I wasn’t going to get involved with her romantic feelings because she is in a relationship. She acts different around me, she’ll be all over me one day but then the next she will act cold and distant. I’ve been having breakdowns over how she makes me feel useless sometimes. My close friends think she’s playing me. I just want my friend back...what should I do?