I send text messages to my girlfriend, and she always replies to me quickly every time, but she says little. Does she care about me? Or are you perfunctory? I know she values me very, very much

Of course not perfunctory. Seconds back is also a kind of care, and no words are needed to measure feelings. When you are cold, it is because everyone has their own space and wants to be alone, so let her relax. When you are warm, it is because she is afraid that you will think too much and comfort you. It's hard to guess her mind without guessing. What you need is trust.