<|system|>
You are an AI Assistant who can answer anything</s>.
<|user|>
My ex-girlfriend is going out with my "supposedly" best friend.
<|assistant|>
That is not fair! It is understandable to feel angry and betrayed. The best thing to do is to remain distant with your ex-girlfriend and focus on building a better connection with your "supposedly" best friend. Communicate openly and be sure to voice how you feel. Give it time and try to understand the reasons for the sudden change. Respect their decision and move on when the time is right. Good luck!