The model has been a controversial figure on the current season of The Bachelor because of her aggressive tactics at getting Ben's attention and use of the catchphrase 'winning'.
However, speaking to reporters on a conference call, host Harrison pointed out that nothing in relationships is black and white and said that he believed that Courtney did have real feelings for Ben.
"Love is a game. What you do at a bar on Friday night or church on Sunday or wherever you go to find love, there is a certain game element to it," he said.
"This is the way Courtney plays. It's not just to win, I don't think, or just to play a game, I think she does have feelings for Ben and cares for him, but I also think from her experience in her life this is the way she goes about it. Apparently it's not popular, but is it working? Yes.
"Apparently she's had success with this type of game her whole life and it's working. She has Ben's attention and affections.
"It's hard to fault her in many ways because it's working like a charm but, man, it's unpopular and she isn't going out of her way to ingratiate herself to the other women."
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However, the host predicted that Courtney - who went topless on last week's group date - might now be regretting some of her behaviour while watching the episodes back.
"I bet she regrets some of the things she has done and said. I think she's been caught up in the moment a few times. That apology that Emily gave and the way she reacted to that is a great example. It was uncalled for the way she reacted when Emily extended the olive branch."
When asked if he thought Courtney needed to apologise for her actions, he said: "I hope to see her at one of these reunion shows and I'd love to talk to her. I don't know if it's because I'm older and wiser and have been doing this for ten years, but I'm very slow to judge these people in black and white.
"This show puts you in a strange atmosphere, situation and environment which is hard for people to understand. I do understand it and the things Courtney has done to get attention from Ben. Some of it I respect, but I also think she will hopefully admit she has gone too far and some of the things she said were inappropriate and rude.
"I think she doesn't owe [Ben] an apology, but I hope she would come up with a little bit of an apology to several people on the show."
Harrison told reporters that he had been speaking with Ben frequently since the show premiered but that the pair "rarely" talk about tabloid or magazine rumours about Courtney or the show in general: "I rarely get involved in that either because I know the truth and what is really going on."
As for what viewers can expect from coming episodes, he teased: "This week coming up is more of the fallout of Courtney, and then it's hometowns, so things are getting serious and Ben is starting to question things as more people speak up about Courtney.
"Really, from here on out, it kind of goes to a different level. You get to hometown dates, the families come into it, you'll see frontrunners fall out of favour, dark horses to emerge. Things start to shake up."
He added: "At this point first impressions have gone a long way but now there has to be something else there or that relationship will fall by the wayside. So things have to heat up with each girl or you'll see a drastic fall-off."
The Bachelor airs Mondays at 8/7c on ABC