So this happened with me. My best friend, her ex, and I all used to be friends. We would text, occasionally hang out, and all that stuff. All was good. She didn't mind us being friends. But then her ex and I started to develop feelings for each other. Eventually she told me to choose between her friendship or him. That upset me but I guess it was going to happen eventually. He told me to choose whoever I wanted. He told me it was stupid that I had to choose since being with him wasn't going to affect my (or his) friendship with her. I liked his answer. I chose him. It's been 3 years. I'm still with him. We live together and we are happy. I haven't spoken to her in all that time though. For me, it was worth it. I think it's very rare for a person to keep both people in this situation. You're going to have to decide which person you'd rather keep eventually. Just like all the others have said.