I have to put with my SO for at least another 6yrs, I stupidly co-signed for him, well about 6months ago we were having a rough patch and he told me he wanted to try dating this new chick, I said ok, cause I still wanted him to be happy. Well he and I never stopped sleeping with each other, when I see him which is every couple of weeks we have sex. Well found out she refused to have sex with him, didn't know at the time and she also thought we weren't sleeping together. At the time I didn't care he was my man and she needed to move on. Well long story short were back together, they aren't dating anymore and they never had sex, but I know they still talk all the time to the point its now affecting our relationship badly. So my question is should I talk to her and tell her what's been going on, and that i like her to back off so we can repair the damage of our relationship since I will have to deal with him for the next 6yrs? Even if we stop being together like that I don't want our friendship to go the drain too. And with her in the picture right now it I'll lose my best friend I also just recently communicated with him what he's put me through these past 4-6 months. But since he's out of town nothing has been resolved on his part.