See, to me the problem is this -

If you just "give in" because it is easiest, that leaves you open to abuse.

I did nothing wrong here. So why should I give up my property because some guy with an inferiority complex doesn't feel right about something his girlfriend did way before she met him?

By that logic, I would own none of my work. Take a street photo - the city can ask for the negs. Take a photo in my house - the company that rents it to me can ask for the negs. Take a picture in the national forest - Smokey The Freakin' Bear can ask for the negs.

Nope. Bad precident.