Ex-boyfriends are a good disguise. We broke up several months ago. I think he has been isolated by his roommate recently. Is it karma?

This is cause and effect. You think he's good at camouflage. Such a person is not worthy of deep friendship and nostalgia, which proves that you are not blinded by love. It is right to leave. Think about it. If you really get married together, how can you be ignorant? It is better to be sincere to people close to you than to others. He and his roommate looked up but didn't bow their heads. They must know what personality is and what temper is, and they will not be isolated until a certain degree, so there is a reason. Anyway, you have nothing to do with him in the future, whatever. It is the most important thing to live a good life, and it must be better than when you are with him.