Sam Sylk Show

Dear Sam, I recently found out that my husband has been having phone conversations with another woman, that I have never met. Well at least before I found out they had been talking. According to both of them (yes I called her), they met at a local spot, enjoyed each others conversations as friends. Now their conversations has gone from the spot to the phone and text. They claim they just enjoy each others conversation and they can talk to each other about things they can't to others about. In his case me, she on the other hand is single and claims he also gives her relationship advice. Where I come from if your husband has a female friend that you don't know he's cheating but these two say they are not. Am I wrong? Is my husband cheating? Who does that?? Please help!!