YES. Unfriend her, block her on your phone, set up a filter to delete any email from her, stop reading anything from her.
No, no, no bad idea. He clearly wants to still be friends with her, I think that's taking it too far. That's actually quite immature, in fact it would be substantially better if he just asked her for some time to sort out his thoughts.
I love desserts and other junk, cheesecake, apple pie, more cheesecake - you name it. Excepting chocolate of course, I can't eat something that both looks and tastes like something that comes out of the wrong side of me - but as I was saying every morning I would go to the canteen and spend cash buying desserts.
I decided enough was enough and to stop myself I'd carry less money and order lunch in the morning when I had highest resolve so I wasn't tempted to spend, win win right?; I save and don't buy that junk. The thing is this worked, but I knew that it didn't solve a thing, and would still spend it on junk, given the initiative.
This may be hard to relate to but I hope you can see the connection, what you need isn't to bar and restrict yourself from her, instead you need to find some type of mental resolve, find reasons, stop thinking about anyone except for yourself right now.
I want you to clear your head, with boyfriend out of the picture, this girl that you're meeting, forget her too, just think of where you currently stand with this girl right now, I'll call her Vienna. Give it some thought, take your time, jog on it, take a couple deep breaths, and watch some anime [I just watched the first 10 episodes of Shingeki no Kyojin:
http://www.animeplus.tv/shingeki-no-kyojin-episode-1 - truly epic so far. Also seeing as I called that girl Vienna consider watching Dear Vienna by Owl City, a very good and soothing music video]. Good Luck, recovery and progress both take time.