yeah listen to the dumb blonde, jules. She's right. And I think you are too, ...sort of..and I'm a man, and not that touchy feely either.
So: DON'T press him to be more emotive. Rather, make yourself consistently a safe place to be, and he will unwrap some. People that didn't have great childhoods, lots of fighting, this too I understand. They want to be calm, because being pounded on and spit on as a little kid is effecting.
I think therapy is nifty sometimes, but, you can't pathologicalize him, nor does that seem to be appropriate. But if looked at as an emotional exploration, a seminar on emotional growth, getting an owner's manual for the emotional brain, he might one day agree to go with you, and enjoy it, and benefit from it.
That said, I have learned a lot from therapy, and over the years, become a more whole, more emotionally diverse person with a wider range. But that will come after he feels safe, feels the fun of potential enrichment and learning that could come from therapy of some kind that you might suggest after he's sure you don't take the position that you're all right and he's an emotional cripple.
There will be times when you'll appreciate his even keeledness. Good luck you two! Remember, he's not something to be 'fixed'.
May I quote Kipling? Hardly the most socially enlightened man, but he has something for you. Here it is: "Softly, softly catchee monkey"