Jenna and Blake arrived at the hotel quite late, because their dinner turned out to be more than just a romantic dinner just the two of them. There's Doctor John Armando, as well as the arrival of a husband and wife that Jenna probably avoids.
Blake could see it from the flash of his eyes and the look on his lover's face. Because of that, out of nowhere he thought of inviting the three of them to enjoy himself and Jenna's engagement celebration.
Of course he did it without coordinating with Jenna, he could do it later. In his mind only one, save the good name of his lover from Hellen, also realized Ryan, that no matter how hard he tried, he would never be able to have Jenna.
Jenna, who had been holding questions since she was at the restaurant, finally couldn't bear to reveal everything to Blake. She had to know why he had made an engagement ceremony that she had never even discussed.