Well damn, woman! First that 'wee bit jealous' thing, now this? A man can only take so much, even from a hottie like Jen. It's pretty obvious (to everybody but Frank) that she's not his type. He needs to bail and head back to Brandy, pronto!
Be patient and enjoy an expensive dinner. Then splash her in the face with hot coffee and leave her with the bill. Before you leave, though, take a pic of the wet T-shirt (sorry. couldn't resist).