I left my ex boyfriend because he was too close friend his a former FWB. He told me to deal with it. I chose my mental health over him. The worst part was in the beginning of our relationship, he said he would cut her off for his own future. Then he blame me for being controlling. It still hurt me deeply everytime I think about it. Once you make up your mind, you have to stick to that decision. Cut them or not, stay with your decision or you will be the biggest asshole.