Okay, let's start with the caveat that I'm not a lawyer.
Your post (assuming all of the details are accurate and you haven't left out any salient points) is really about two issues:
1. The model release.
2. A usage agreement.
As for the model release, it gives the photographer the right to publicly display or sell photos. Most states say that even without a release you can display them on your personal website or in your portfolio--you just can't sell them, put them on posters in the subway or on a billboard on the freeway or in a magazine ad or stock photography sale.
The usage agreement (which is not the same as the model release) says that the model gets to do "X" with the photo or photos. What "X" is depends upon what that agreement says. Most photographers say they can post or even sell the few photos they provide but can't edit them. Here's the thing: the model grants (or doesn't) the right to publicize the photos. But barring a contract selling the photos to the client (the model), you OWN the photos.
Now, I'm betting that you probably shared all of the photos with the model. First, generally speaking, unless you've somehow broken the agreement in deed or spirit (by doing something you told the model you weren't going to do), once the release is signed, someone can't just go in and say "I'm having second thoughts." Too late, it's been signed (BTW, I"m assuming the model is 18 or over). Second, irrelevant of what happens with the model release, you OWN the photos (unless you sold them to the model). If you gave the model permission to post them, you're sharing that right or ownership. But the model doesn't own the photos (or share rights).
Last of all, separate from the legalities of it all, here's my advice: if the model posed for you and is then having second thoughts (boyfriend is unhappy, parents threatening to disown her, whatever), don't display the photos. If any money changed hands, then she needs to give it back (i.e.: if you paid him/her to pose). There is what is legal. Then there is what will get you more models and more cooperation (especially if you're shooting TF work). If the word gets around that you shot a model, he/she got uncomfortable and you said "hah, hah, screw you, I own the photos, I'll do with them as a I will..." you get less TF opportunities.