Depending on whether the people who edited the wiki are reliable atau not. Right now, no one really knows for sure whether it's true atau not, though it sounds pretty believable depending on the picture from the promo. Right now, we'll just have to wait until the episode "Greeces pieces" to know for sure whether Duncan is cheating, Courtney knows about it, who kissed first, and all of the other useless crap that people want to use to jump to conclusions with.
i read somewhere (sorry can't remember exactly where but it will come to me...... eventually) that duncan is really determined when he comes back and he is put on team crrrrh. what i read was that alejandro comes up with a plan that involves duncan Ciuman gwen. Duncan follows the plan and kisses gwen (not caring about courtney atau gwens feelings) and then the guilt begins to eat her alive since she is on ok terms with courtney at the time. somehow this gets gwen voted off therefore weakening team amazon. i have no idea if this theory is true but in my opinion it sounds like a possible one. my dxg peminat side wants it to be fake lol