In the movies, one of the most popular heroes is the strong, silent type. Think Jeremiah Johnson, or many of Clint Eastwood’s western characters. In a movie that can be very effective.
But in romance writing, it can kill your story. The only way we have to know your hero is through internal narrative. Too much internal narrative drags down the pace. Or worse, readers skip the large paragraphs and get to the dialogue. How much of their story did they miss?
You can show his reluctance to speak. Give him short, curt sentences. Use body language in briefs sections. This type of word usage will get the point across that he’s not a yacker. And it will keep the reader interested.
What is your favorite type of hero? The guy who spills his guts easily, pours on the compliments? Or, the one who says little, but when he speaks, he packs a punch?