That imbalance is telling you something, and your internal voice already knows what it is.
When you are on the outside holding everything together, staying loyal, managing the worry, keeping up with every detail of his situation, while he appears largely unconcerned with the details of your life, that is not just a communication gap. It is a relationship dynamic playing out in its most honest form. Incarceration strips away a lot of the performance that relationships can hide behind, and what is left tends to be a more accurate picture of how invested each person actually is.
Some of that imbalance has a practical explanation. He is in a controlled environment where his world is small and contained, and news from inside travels to you naturally through calls and letters. Your world on the outside is larger, more complex, and moving faster, and he may simply not be asking the right questions or listening closely enough when you try to share it.
But some of it is something else. A person who genuinely values their partner finds a way to be curious about their life even from inside a cell. Letters ask questions. Phone calls go both directions. Interest in someone does not require freedom to express itself.
You said you do not want to feel this way anymore. That is important. That feeling is not a character flaw or a failure of loyalty. It is your honest response to a situation that is not giving you what you need.
There is a full life available to you. The courage to go look for it is the only thing standing between where you are now and where you could be. Trust that voice.