I do see this point made often though, as if to say: 'You may as well reconcile with a cheater. You have zero way of knowing your next partner won't do the same.
I see 'always D' voices paint pictures of people easily finding faithful partners if they leave their WSes. The General Social Survey indicates that 1 in 4 men have cheated and something like 1 in 4 or 1 in 5 or 1 in 6 women have cheated. So finding a new partner who will be faithful isn't a slam dunk. Hell, finding a new partner of any sort isn't a slam dunk.
That's very different from asserting that a BS should therefore R. That's jumping to a conclusion that simply isn't supported. I don't see that, though I don't spend much time on social media. The only other fora I've seen on healing from infidelity are pretty low quality, IMO, though every so often a post surprises me with its humanity.
I think a lot of people make bad assumptions about what certain sentences mean.
IMO, it's dumb to split because one thinks finding a new forever-faithful partner is easy. But that is not saying that one should R because finding a good partner is difficult.
As Bigger says, the only reason to R is that both people want to R. I add 'and will do the work.'
In fact, I think virtually all the SI voices that have R'ed would say that fearing being alone is usually a lousy reason to R.
fBH (me) - on d-day: 66, Married 43, together 45, same sex ap
d-day - 12/22/2010 Recover'd and R'ed
You don't have to like your boundaries. You just have to set and enforce them.