I personally, just feel no threat. A women doesn't have what I have, and can't do what I do. My ex loved bieng bi, but needed and couldn't give up her dick. (me) Maybe, if she was more towards bieng a lesbian, might have been a different story.
out of all the things and places, I have never done it on a train. I gotta try this. Thing is that I don't take the train anymore. I drive to most places, except work, but then it's too packed.
My ex (recent) was bi....and I was always okay with it... I never thought of it as cheating... She was also the type that would hook up (all the way) with them, but never would get into a relationship with them. I guess, I was okay with it because I'm confident with what I have and the way I offer it. I would still get into a relationship with a bi-female and let her have her fun with other women. I guess I'm open minded..
Give her a call...to make sure that she is alright.. see how her reaction is when talking to you... maybe she is busy...after that...let her call you...