The most appropriate crisis counselor response is:
“I hear that you are feeling betrayed by the actions of your partner and you have lost trust in them. You are also thinking about ending your life. Does that sound about right?”
This response validates the individual's feelings and actively engages them in a conversation about their emotions, showing empathy and understanding without making the session about the counselor's personal experiences. It allows the individual to clarify and express their feelings further, which can be crucial in a crisis situation.