They can be incredibly cold and unresponsive to others. Over the years, relationships become one-sided. Until exhausted from trying.
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@LnzyHou Just speaking as an introvert myself, I respond to everything emotionally. It makes me good at acting, and it makes me good at designing software that people can easily use. I'm not cold. I feel things a LOT 🙂 And, after work, or on the weekend, I need to be alone to...recover myself, I guess is the way to put it. I can see how that can appear as cold. But that's not what's happening.
@Gerry
If emotions are internalized and not expressed, relationships can be very challenging. I’m not suggesting you are cold. It is how I, as an extrovert, have experienced many introverts. They never agree they are cold. Despite admitting others have told them the same thing.