He is furious at her at the moment he grabs her, calling her a hateful woman. This isn't about love or sex, it's about hate and it's an attack.
I don't feel like sitting back and letting the rationalisation brigade come in and start telling us all about the various subtle ways in which this might make some kind of warped sense, or even come from love on some level. That kinda nonsense doesn't fly.
This was a bullshit storytelling decision which was executed terribly, and is part of a pattern in this show where it is all too eager to show women being sexually assaulted on screen and, while I'll keep my mouth as shut as possible on the point, does not actually even come from the books so it can't be justified as necessary to the larger story. All of the worst of what I'm talking about - from Dany's rape by Drogo in S1 and her subsequent love of him, to Ros being strung up and killed by Joffrey, and now to this and countless little instances of incidental humiliation along the way - this show is absolutely fine with exploiting sexual violence against women for very little meaningful return beyond reveling in its own depravity. It serves nothing.
There was a better way to do this, and through incompetence and ignorance, Game of Thrones done fucked up big time this week.