I think that as long as it feels like a choice, you haven't experienced your limit.
When your limit is met, you will break. That's just a matter of fact.
Nothing can be stretched indefinitely, everything has it's limits, and when that limit is met, it breaks.
I do believe that it "can" be chosen, but I also "know" that sometimes it's not a choice but the "only" thing a person can do.
I haven't been there yet in my life. I have been able to choose to stick around so far and honestly, with what I've lived through so far, I doubt I'll ever find my own limit and subsequently break.