Husband interested in men

Been married for 25yrs and 3yrs ago i found out that my husband has been having chats online with gay men and using a fake facebook account. At the time he begged me not to leave him and told me he was just doing it for fun so i gave him another chance. 3wks ago i again discovered that he was again on gay dating sites and also placed an add looking for men where he advertised him as being a bottom/versatile.He still dont want to admit that he is interested in men but cant give me a reason for why is doing this. Is my husband gay and living a lie.Please help me to figure this out