*When to leave ….. or change thoughts?

I was listening to the podcast about When You Decide to Leave (great episode).  First of all, I had no idea Brooke changed her relationship with Chris.  Haha, I guess I missed it!  I’m wondering though (from a place of curiosity, NOT judgment) couldn’t she have just changed her thoughts about the relationship?  And really that’s the case with all separation/divorce etc?

And not saying we all have to do that, but is it as simple as that? Any relationship can work / continue?  But of course, we can also make the decision to not change our thoughts about it? Thanks in advance …. hopefully my question makes sense, I’m having a little trouble articulating it this morning.