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Myers-Briggs claims that ISTPs are the most prone to keeping very important things to themselves. Naomi Quenck warns that one should not attempt to have Ti dominant types share their feelings while under stress. In fact if you are lucky enough to recognize there may be a problem with them, just allow them to work it out on their own.

It's clear that ISTPs may have a plethora of reasons for not sharing their feelings that can range from being burned when younger for sharing their feelings (Jung describes Ti types as those most susceptible to being taken advantage of in relationships). Ti in general (or Te) has Fi as their opposite depending on whose theory so they have problems with internalizing their feelings. Or they may take their feelings too lightly. Also Ti is highly independent and consider that to be a sign of vulnerability and oh yea did I mention that Myers-Briggs, Keirsey and other theorists say that STPs are the types that are most prone to the belief that talk is cheap and that action speaks louder than words? I would think that both types would prefer to show their feelings by taking some action.