bdub, she actually tells me that she is "spending an overnight" or "staying overnight". Nowadays, she never mentions his name, or where she's staying, etc. I assume that it is with the OM, and I never ask.
I am virtually certain that it is ALWAYS with the OM because when she spends days with her friends, she is very detailed about who she's going to be with, where, and what time, etc.
M: 15 years BD: 6/25/14 EA/PA: starts 5/14/14 11/30/14 - A ends 5/15/15 - D is finalized. 11/28/15 - Start of new LTR with a wonderful woman (and still going strong)!