In response to her request for a dinner together, what if I say something like, "If you’re still talking to that other guy, I don’t think it’s a good idea." Thoughts?
Sounds really weak.
To elaborate, it's very passive compared to the prior suggestions:
Originally Posted by "AnotherStander"
You are actively engaging in an affair and I feel I need time and space from you right now to consider my options moving forward.
Originally Posted by "CWarrior"
No. I adore you, I still can picture a better us, but I won't do an open relationship anymore.
Originally Posted by "LHS"
I am sorry I already have plans. I’ve thought about it and this isn’t working for me. I’m not interested in being in an open marriage.