What Does It Mean When The Person Only Responds With a Short Sentence When Texting?

I understand that if the person isn't interested in you, that person won't respond.
Also, if the other person responds with just one or two words each time, he/she isn't interested but doesn't want to hurt your feelings.
But what if that person responds with a short sentence each time? I'm unable to get to know this person. When this happens, I feel like I'm doing all the work.

What Does It Mean When The Person Only Responds With a Short Sentence When Texting?
What Does It Mean When The Person Only Responds With a Short Sentence When Texting?
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