I don't think he said he had a wife yet, unless I missed a dialogue choice. I think he implied he would have to take a wife from the noble caste, though.
I rather thought Rica was the one person Bhelen did care for, to some degree, though getting a paragon as a sister or brother in law certainly gives him an extra motive, so I can see where you might feel the opposite was more likely. However, there's no suggestion he wasn't treating Rica very well either, so I'm inclined to give him the benefit of the doubt.
As I recall, he did get married at some point. I believe it's for a DC on return to Orzammar, and I think Danaduchy showed it in her DC returns to Orzammar video (what would we do without Danaduchy?)
EDIT: Yup, just checked it. Rica says, if you ask her if she'll be queen, "Of course not, his wife will be queen". While Bhelen says his son by Rica will "have the same rights as any son of my wife's body". Both lines indicate that he's already married at this point.
Honestly I just never thought he valued her as anything more then something he could use. He doesn't even value her enough to tell her the truth about things (though politically I can understand why. Telling her "I got my two brothers removed from political consideration by my machinations" might just make her think he's a bastard -- which he is
). She's operating under a belief that Harrowmont and the DN conspired together to get rid of Trian and Bhelen, because Bhelen told her that.
Which to me shows just how much Rica adores him, that she will so readily believe him. In fact, I'd see it as rather manipulative in nature, taking a casteless girl who has very few prospects and leading her along with such things because he's her only hope. That he treats her well is good, certainly, but he kinda has to if he wants to keep up that facade. But it doesn't necessarily mean he actually cares about her.
But I'm sort-of a cynical bastard, and it's well known I don't really care for Bhelen (it's not even really hate anymore. It's pity, really, and that's because I fleshed out Xanthos even more lately)
Also side note, but Orzammar's swiss-cheese nature shows through when Vartag says the Assembly "is no place for a woman". So Lady Dace and the other female deshyrs are what, guys with some pillowy man-bosoms?
EDIT 2: Oh yeah, and Bhelen will "embrace you as a brother" even if you're playing a woman 
Still, my own beliefs on the thing aside, I'm not saying people need to change their own stance. If in their world they believe Bhelen does care about Rica, then I have no problem with that. But from my perspective going off of everything Origins shows about Bhelen, I don't personally see it.