I'm not telling you to make demands. As someone stated above, you set BOUNDARIES, which is very different. Demands DICTATE to someone else what THEY need to do. Boundaries COMMUNICATE to someone else what YOU are willing to put up with (and not).
"I will not live in an open marriage" is not a demand. It's a boundary.
You seem to think something isn't worth doing because she's "gotten mad." WRONG THINKING. Until you learn to stop operating on a basis of "How will this make her feel? Will this make her mad? How will her being mad at me, make ME feel?" (this is co-dependent), and instead learn to operate from a framework of "WHAT IS THE RIGHT THING TO DO IN THIS SITUATION? What is the thing that God Himself would have me do if He were standing right in front of me?" . . . you will never get anywhere.
Put MUCH more simply, what you're doing ISN'T WORKING, and it's NOT "DBing" to keep doing what isn't working, sorry.