then just tell him. It's a beard, he probably isn't a lumber jack or on SEAL Team 6 so he is wearing it for fashion. I had a buddy grow his out... his wife hated it. So when "no shave November" came around she took it to heart also. Needless to say he quickly trimmed his beard and his wife shaved again.
Ask him to shave it all off for you so you can see what he looks like without it. Maybe for Valentine's day or your birthday he would do it. Then always say how sexy he looks without all that. He will probably let it grow back so it will be short lived. But he might love the compliments and he might love you enough to keep shaving it However, he may not love you enough to even do this. He might but his facial hair before you. So get ready for that if he says no
its tough if it was like that when you began dating, bc he was outright about how likes his beard.. he had every reason to assume you were ok with it. I don't know if there's much you can do bc he probably like wearing it that way, and it is his face. its like if you liked wearing your hair long, and he liked some hair but not much. but you had your hair long when you met. if it was me i wouldn't want to be with someone who wanted em to change something i thought they liked. bc it was part of me when we met.
i think, you have to figure how person is when you meet is how they are going to be for worm time until they'd acid otherwise.
id just decide i can accept this, or i can't. i wouldn't try to gently imply I wanted him to change bc not matter how much finesse you manage , its the same message.
its not like losing weight or eating right. his hair isn't a health concern unless he doesn't keep it clean,.
I'm sure others will have a different view, in case this wasn't helpful:)
Aka him if he's thought about trimming it and that you think it'd look nice. End of the day it's his decision but if he knows you think it'd look good shorter and he's not like completely committed to the grizz he'll probably trim it without you having to specifically ask him to.