If you’re writing paragraphs and they’re sending one letter, the gap is the answer.

Effort has a volume, and mismatched volume is a message. When one person writes at length and the other answers with a word, the gap is not about typing habits, it is about how much space the exchange takes up in each of your days. You can keep explaining that away or you can read it. The imbalance is the content.

Try matching their energy for a while instead of compensating for it. See what the conversation looks like when you are not the one carrying it. Put your long messages where somebody writes back.