Sorry to hear about it. It's really a slippery slope when it comes to these things.
I think we've all been in that situation where something happens and you already know before the outcome that things won't be the same in a relationship.
Not to jack the thread but this topic raises a broader question; what do you when faced with a similar situation? How do you win?
The way I see it, when you tell a girl not to do something, there are but a few options, none of which seem pleasing:
-she listens to you, but resents you for being controlling. she may take this out on you in another way
-she doesn't listen to you, and does what you told her not to do (in which case you either
leave her, or give in to her power move and revert back to afc status)
I know when stuff like this comes up, you should be ready and willing to walk, but if you have a history, especially if you're in an exclusive relationship, it's not that cut and dry.