Is it wrong for me to want a partner if my husband is impotent?

My husband hasn't been able to ually satisfy me for year now. He knows that I am frustrated about our life, but so far hasn't suggested that I go out and find a partner. I really love him, but I need ! I have been considering finding a monogamous partner. Someone who I trust. I kind of already have someone in mind. Im just not sure about this...it seems so wrong. HELP!