Pavelka will choose between Vienna and Tenley on a trip to St Lucia during the finale, to be shown next week.
"People will have to watch to see if he proposes, but I can tell you he does choose somebody," Harrison told People. "He's still with the woman he chose, very much in love, and they're doing great."
Harrison also insisted that the show never claims to find lasting love, even though previous contestants Jason Mesnick and Molly Malaney will marry this weekend.
"I've never put much stock in creating happy couples that last," he explained. "We don't guarantee anything. It's up to these people. Some have been happy and some ended horribly. That's life and love. It's unpredictable.
"But that doesn't mean I'm not ecstatic that [Mesnick and Malaney] are getting married. I pray all these couples last and get married. It reinforces what we do on the show."
The finale of The Bachelor will air on Monday night on ABC.
> 'Bachelor' finale 'has beautiful ending'