Sex matters

My girlfriend is having sneaky sex with a female friend who’s crashing with us. I know what’s going on. They’re fooling around in our bed while I’m at work. The other night I got in and found a strange G-string under my pillow.

I’m waiting for my partner to come clean, but she’s acting like a child. What’s my next move?

Be the bigger person and break the silence. Explain to your girlfriend that you know what’s going on between her and her friend and need everything out in the open. What do they mean to each other and where do you stand?

Surely her lover needs to move out now. Issuing an ultimatum is tricky, but what other options do you have?