<human>: A pretty boring relationship issue, but it's getting in between us.

My boyfriend and I have been together for 2 years-ish, we had some complications in the beginning but for the last year and a half I've had unwavering confidence in his love, commitment, and our happiness as a couple.  No drama or secrets between us so far as I can tell, and barely any arguments.  Sex life is fantastic.  I wish to be with him indefinitely and things are, for the most part, really good between us.

He's a highly introverted person, I can deal with that.  Although it impedes on certain desires of mine it's not too big an issue.  The issue lies in communication- he can't verbally communicate his feelings or his deeply emotional thoughts to me, something I desire from the person I am with.  He has explained that his condition is frustrating to him and he's always been this way.  No amount of coaxing or tactics I use to get his true thoughts out of his head, you know, the deep and important ones, works in terms of verbal communication.

He can write them down.  He has sent me messages and IM's detailing some of the things he cannot say.  But I find face-to-face communication important.  It is intensely frustrating to ask a question and sitting in silence for 10 minutes before he answers, "I don't know" or "I can't say".  It's excruciating at times to both of us.

Basically, I'm wondering if anyone out there has been like this, has been with someone like this, if there's any way to cope with it/change.  I told him he should talk to a psychiatrist and have a big long letter prepared for the inevitability that he can't make words come out of his mouth.

Can you condense the text into three sentences or less?
<bot>: boyfriend suffers from odd strain of mutism, I'm wondering how we can 'fix' this to avoid lifelong frustrations.