Interpreting someone's response can depend on the context and the relationship dynamics between the individuals involved. In this case, your husband's response of "not necessary" when you asked if he had anything to do tomorrow could be understood in a few different ways:
No Obligations: He might be saying that he doesn't have any specific obligations or commitments that require his immediate attention the next day. It could imply that he has a relatively free day and doesn't have any urgent tasks or appointments to attend to.
Open Schedule: He might be implying that he doesn't have any fixed plans for the day but could still engage in activities or tasks if he chooses to do so. This response suggests that he is flexible and open to various options for how to spend his day.
Casual Response: Sometimes, people might provide brief responses without going into detail, especially if they don't see it as a significant matter. His response could be a casual way of saying that he doesn't have any pressing matters to address the following day.
Possible Miscommunication: It's essential to consider the context in which the question was asked. If he misunderstood the question or thought you were merely making conversation without expecting a specific answer, his response could be different than if he thought you were asking about something important.
To better understand his response and avoid miscommunication, you can follow up with a more specific question or ask for clarification. For example, you could ask if he has any plans or if there's anything he would like to do together the next day. Open communication is essential in any relationship to ensure both partners are on the same page and understand each other's expectations.