I believe he had someone on the side but something doesn’t add up. She says in the article that he sexted the girl while Daniele was handing out gifts to the neighbourhood children. But in the episode she says this is the first Christmas that she’s been in the Dominican and we saw them do the Christmas hand out.

So it’s more likely he was cheating but on and off throughout the relationship and then as the relationship soured he was fully cheating and when he dumped her as we saw, he went over to the mistress as a single man.