Give me your opinion on my intimacy issue?

I've been married to my husband for 7 years and we have 2 kids. We are in an interracial marriage. I have 2 kids from my previous marriage. Unknown to me, my husband was abusing drugs before our marriage. Due to his drug abuse he cannot perfom ually for the last 4 years. Upto to know I have been a very a faithful wife, but I have my desires and needs as well, which go unfulfilled. We have sat down and discussed this issue, but he ignores it. He doesn't seem to care about my ual/emotional needs. I am very spritual person who believes in the vows of marriage. Due to health conditions he is unable and refuses to take any enhancement rememdy. So I am left with only 2 options. 1. Either I have an affair 2. Depress my desires and live like this. Could you please advise me on what I should do about this situation and divorce is not an option.