Opinions please!? What do you do when you catch a "friend" talking **** about you? What would you do?

I confronted her after the fact without other people around. It still bothers me very much and I m trying to forgive and I can t understand why. She s a good friend but I don t know why she would put me in that light considering I have been nothing but a good friend. I have been dating a guy friend of hers after a horrible break up. They have been room mates for about 8 months and have known each other since they were 8 years old. They are now both in their 50 s. I know for a fact there is nothing going on sexually, however it seems as though she is being territorial. I can t figure out if it is because she is being protective of him or because in some way he is kind of her man regardless if there is a sexual relation. He was married for 20 years and they nick name her the succubus. What I heard her say was that I was the succubus replacement! Holy F B we never had any issues up until this point and I knew it was a bad idea to get involved with friends. Sorry for the rant I just need to give details in order for you to form an opinion. Question is . . . Would you forgive and forget? Still seems some tension there. Also, would you ignore it and let her have her jealousy or whatever it is and what do you think about ever having trust there again? I want to but I m struggling hard with my feelings and I know I am nothing like his ex. I am me and not even close to being like his ex. I don t cheat, I m honest to a fault and it really bothers me to be compared to someone like that!