You know. I've been told that. Several occasions. Had more than one ENTP look me in the eye and seriously tell me that. The Is haven't been as vocal, but it's the same sort of fusion, like a roaming body meeting it's severed spirit. They seem very bullet-proof to me in general, but when one turns up on my doorstep, I know something's wrong. My ENTPs haven't been "criers" so to speak, but I've had a few of them crack on me and I knew it was one of those intensely personal, potentially crushing moments for them. If they aren't acting "logically" or emotionally casual, they seem afraid sometimes. I like to be a safe place for them to split open if they need it. They know I won't hurt them and that I won't let them be hurt as long as I'm there.
My NTJ best friends call/come around when they need some affirmation. They aren't the types to be "cuddled" really (ok, the ENTJ loves it and gets it aplenty from my sister as I'm not very naturally affectionate that way) so I listen to them and genuinely support their emotional responses which they seem to be most unsure of in their realm of linear being.