High Octane Passion vs. Low Octane Passion

I was watching the Cary Grant and Ingrid Bergman classic today, "Indiscreet;" I love the scene where Ingrid Bergman has just found out that Cary Grant is a single man and not married (and unable to get a divorce) like he had stated. In an downpour of tears, she says "How dare he make love to me when he's not a married man." Then she storms into her boudoir and slams the door. Dramatic? Sure. But I see it as passion. It's passion that makes me feel alive. I'll listen to Tchaikovsky's Romeo and Juliet and tear up. I get moved easily, by life, and love.
I've been struggling with completely letting myself go with the boy. I want to call him just to hear his voice. I want to see him just because I miss him. I want him to stay over just because it feels good to be in the arms of someone I really want to be with. But, I hold back.
I hold back because it might suffocate or freak him out. I hold back because he is a lot more "toned down" (using his terminology). He doesn't express his feelings in a manner that I am familiar with-- the little things that would signal to me that I am in his thoughts is kinda missing. Probably not missing altogether. He is very thoughtful and considerate. Just a different type of thoughtful and considerate. And I love that. It's just taking me some getting used to.
In another pathetic attempt to have a conversation about this, I brought it up last night. He listened. Like he always does. Not a big participant though.
I've gotten various explainations from him as to why he is this "toned down"-- first he had mentioned that it concerns him that this might be a rebound relationship for me due to my recent divorce, and so, he doesn't want to put himself out there too much. I have also gotten that this is just how he is. I have also gotten that the previous breakup has made him more cautious.

How did it get from this nice, casual, fun getting-to-know-eachother-thing to this more complicated thing (for me at least)? I know how. Because I am falling in love. And if I didn't hold myself back, I would have been in love by now. I have no shame in admitting...I am pretty damn nuts about him. Toned down or not, he is a special breed :-)

And all this holding back, is actually doing a world of good for me. It's teaching me to slow down. It's teaching me to enjoy time by myself and cultivate my life. MY life. So, while I bitch and complain about how I don't know how he feels and how I can't read him; I appreciate whoever he is. It's just a learning process while I "really get" to know this breed. The Bull.

So, while I had this inner dialogue in my head today, of what i call high octane passion vs. low octane passion, I baked Alton Brown's Tres Leches cake, which turned out heavenly. Let the milk soak in overnight in the fridge. http://www.foodnetwork.com/recipes/alton-brown/tres-leche-cake-recipe/index.html