Happiness is not a switch that flips on release day. It is something that gets rebuilt piece by piece, and it looks different than it did before. The expectation that everything immediately returns to normal is one of the most common and painful traps people fall into after release. It does not work that way, for the person coming home or for the people who waited.
What does work is focusing on the things you can control. A routine, a purpose, someone to come home to. Having someone who loves you and is genuinely in your corner changes the entire experience of reentry. The isolation of coming out with nothing and no one is the version that tends to go wrong. Coming home to a stable relationship, even a complicated one, gives the returning person something to anchor to.
He is going to have adjustment ahead of him. Reentry is disorienting in ways that are hard to describe to someone who has not experienced it. The world moves fast, expectations from all directions pile up quickly, and figuring out where you fit again takes real time and patience. That is normal. It does not mean something is wrong with him.
The honest answer to whether he is going to be okay is that it depends on what kind of support surrounds him and how seriously he takes the work of rebuilding. People who approach it with realistic expectations and the right people around them tend to land on their feet. The ones who rush it or carry unrealistic expectations about what release looks like often struggle more.
He has you. That is not nothing.