Justus is happy his son has gone off to college and is now able to go back to going out, taking trips, and being more carefree. justus is enjoying his:

Justus is enjoying his spacious nest. The spacious nest is a way of having a positive descriptive term or a positive thought of the mind which could occur in situations like having a child gone off home or to be married with someone. It could be seen above as Justus feels more happy after having his son gone out and enjoy his life.