Is there a “safe” point where you know things won’t fall apart?

At what point do you stop wondering, “Is this actually going to work long-term?” and start thinking, “This is just part of who we are now”?

My wife (34) and I (34) recently started exploring the hotwife lifestyle, and so far it’s been an incredible experience for both of us. We communicate openly, trust each other, and neither of us has experienced any major jealousy or issues.

But I’m curious about the long-term side of things.
For those who have been doing this for years, was there ever a point where you felt like you’d passed the risky stage and knew your relationship was solid enough that the lifestyle wasn’t going to tear you apart?

Or is there never really a “safe” point, and things can change at any time?

Would love to hear from couples who have been doing this long-term, including the experiences that surprised you or things you wish you’d known when you started.