Unless the comments are about far into the future..

But they're not in a relationship so he is definitely allowed to have sex with others? Not only that but both he and psychic witch are in a contractual relationship? And it definitely isn't mentioned in the contract that he isn't allowed to have sex with others? Not only that but its way too soon for them to even grow feelings for each other. He just got his heart broken and she obviously knows it as well. At this point in time, neither of them like each other in that way. They're literally just friends with benefits