Dear Abby: I love a married woman who refuses to leave her husband

Dear Abby: I am in love with a married woman who loves me too. We meet up for awesome sex. She refuses to leave her husband out of a strong sense of responsibility. She says she’s afraid that if she does, he will harm himself. She claims they are not having sex because he can’t, even after trying many remedies. I am single and OK with our relationship. Is there something wrong with this?