He felt bad for Felix; he just couldn't empathize. If he were any kind of actual male human, he'd be way into sex. It felt more of a chore sometimes with Rita. A necessary one and they did conceive a child together, but he never really had any desires. Well...there was once and she was a mistake from the start, but that was in the past. Knowing that Felix's loneliness was manifested in different partners, he lacked knowledge of the right thing to say.
"My sister was like that," he answered in lieu of anything else tangible, really. "But she found a really great guy in the most unexpected place and they were together for a while, but. Being a cop kind of ruins relationships. Too much stress that gets taken out elsewhere."
He gave Felix a light touch on his forearm to signal him to continue if he wished. If not, he was there and still listening.