Just a wild thought, but what if Han had more trouble integrating into the rebellion and his every day live after his time frozen in carbonite?
For example he could want to lead the fighter squadron but must realize that his eyesight isn’t good enough yet.
So we could give him insecurities about himself that he might project at his relationship with Leia. And this tension would be resolved by the “I love you”,“I know” scene. (the one by the bunker, where Leia gets shot and shoots the two troopers)