We had a 3 some and my wife's old school friend. She said next time would have another guy join us. We hired a guy to do odd jobs around the house and she said him, that's the one.
So Saturday he arrived for dinner and drinks. She was all over him that night. She gave him a blow job after dinner, called breaking the ice.
I was not so comfortable with it, but I let it go. To the bedroom where he finished and I stared with her and she acted strange. He worse a condom and did not seem to do such a good job. She actually seemed to fight off orgasm with me. I could feel her pussy working and knew she came. Just not the sounds she usually makes. As she is cumming she calls him over, he will be finished shortly, let me get you ready. She started sucking his cock and getting the condom on him. I finished and got up. I watched and he did his thing, not so good but she faked an orgasm.

We had sex Sunday morning and its not the same. She seems strange and not reacting to me any more. I called her friend and ask if I am missing something, she had not told her anything. She called me today at work, told me he was coming over tomorrow, would fix the attic light and move some things for her. She said, I promise not to fuck him while he is here.
going to give it some time, if this does not correct, will kick her ass out.