Well, you need to see what I said in the context of the extreme behaviour described in the post I replied to. I didn't mean to give the impression that INTJs are on the complete opposite end of the spectrum. Or imply that they wouldn't be completely devastated by the news and react emotionally or lash out in some form, feel fundamentally hurt. But from what I've observed (and my remark went way beyond this cheating situation) we prefer to face difficulty (and its consequences) rather than avoid it. We're more geared towards solving the situation (possibly dissolving in this case) and we do tend to have a capacity for empathy. Both are helpful in (emotional) crisis situations.INTJs deal better with the truth than you think they do. Better to tell them an unpleasant truth than drop them in the fog. They can work with unpleasant truths in understanding ways.
I find it difficult to see how withholding information can be constructive in this situation. Avoiding hurt and trying to preserve the relationship are not (necessarily) the same as constructive IMO.