If I were you... If it was me... I would look at this big-picture-style. Something I would never do is to analyze everything he does wondering if he cares as much as I do. I would almost guarantee you he can feel that if you're doing it. And it feels like pressure. And that kind of pressure can make people freeze up. Because in a way, it's keeping score. No one likes that. And people don't do that when they have a true understanding and acceptance of each other, established via communication over time.
I would prob write him an honest, non-dramatic, to the point email about how I work. Acknowledging that you work differently from each other and asking him if he minds that you are expressive/relationship focused or whatever your dominant emotional mode is. And then I would proceed to be myself! It's so much better to not tip toe around things and to not let that stuff turn into negative emotions.
I suspect more emotional people feel that more stoic types have the power in a relationship. But the funny thing is, the stoic types often think the converse! I am very expressive. In the past, I was self-conscious about it because I figured it can be off-putting for less expressive types. My INTP makes me feel so many good things, I can't keep it in. I asked him if he minded how expressive I am once and he said that he LOVED how I am. BUT that it did make him feel guilty and freeze a bit sometimes because he was sure I wanted him to reciprocate and he just isn't like that to the degree I am. I explained that I never expected that, and was just so happy that he liked that part of me. That conversation made us really close because we both then knew we were free to be ourselves, therefore content.
I don't think anyone can leverage out of another person something that they don't want to give or something they aren't, but there are definitely ways to bridge a communication divide. Provided there is true acceptance and respect for how each other works.