<human>: Names have been altered to protect everyone involved. 

Joe (28, male, single) has been mentioning that Steve (30, male, married for 7 years) must not be fucking his wife (Amy, 29, female, married for 7 years) right because she's been extra flirtatious lately (she has been very flirty, calling people sexy and being touchy feely). Last night, I was over at Joe's house with a few buddies, and Amy came over. She went into Joe's room, and they closed the door, turned some music on, and turned off the lights. 
After over an hour, the rest of us left, feeling uncomfortable and unsure of what to think. They were still in the bedroom. 

Now here's the question: do I approach Steve and tell him what happened? I don't know if they were committing adultery, it just seems inappropriate that a married woman spent that long behind closed doors with a single man. I'm torn, and don't know what to do. I want to do what seems right and tell Steve, but I don't want to start a fight with Joe. Can someone help me, please?

Give me a shortened version of the text
<bot>: I suspect infidelity between Joe (28, male, single) and Amy (29, female, married for 7 years) because they were spending an inappropriate amount of time together, alone and in the dark.