My DH is very shy, very quiet, although he is cripplingly shy and quiet with everyone, doesn't really like to go out with friends, etc. It does get me down at times, and I am quite arsey with him about certain things now we have DS: I do not find it acceptable for him to not acknowledge that I am speaking, or have spoken, to act as though I've not just asked a question, to mutter or grunt a non-commital sound in lieu of an actual answer,and think this is bad behaviour for him to model for our son. He also never pays me compliments, acknowledges things I've done, says encouraging, romantic or flattering things, etc., which I also think isn't a good example to set. The most enthusiastic comment he has about anything is that is was 'alright' or 'quite nice'. When pushed for an opinion on the birth of his only child, he struggled for several minutes, then came out with 'lovely' in an unsure tone.
He isn't negative, unpleasant or insulting in any way. None of this comes from malice, being uncaring or whatever. But it is getting increasingly... I don't know - exasperating? Boring? Upsetting? We do have a good laugh about stuff and interesting discussions, which is wonderful, but it just leaves me even more frustrated that he can be so expressive and vibrant in areas he is confident in,and so grey and shut down in other ones (more important ones, actually).
Could your Dh's background play a big factor, OP? My ILs are the most emotionally shut-down and inexpressive people I have ever met. Again, not horrible, but they struggle to even be as descriptive as naming the colour of someone's hair! FIL is also an incredibly silent man, as both his parents were deaf and he is hearing. My poor Dh and his siblings just never experience being talked to, complimented, encouraged to express themselves, talk about problems, nothing, only a bit of light chitchat and discussion suitable for the dinner table. And, importantly, not taught how to 'give' verbally to others, either, as they were not given to verbally themselves.
I have to accept that DH will always be quiet and not a verbal Casanova, but he does try, and he is wonderful in so many other ways. It's about assessing the balance and seeing if taking that rough with the smooth is enough. I know, for example, that I prefer my quiet and unflattering but very supportive DH who truly sees and treats me as his equal, to my gobshite dad, who never shuts up, who can be v funny and charming, but he is an annoying, lazy, shallow egotist a lot of the time.