We simply have to surmise that this is the case on the basis of external evidence: that we never feel we have much to say to them, even though — objectively — there might be so much to share.

我们只能根据表面来猜测，原因是这样的：我们从不觉得有话跟他们说，即使，客观而言，我们有很多事要分享。