Cythraul, I was in your situation once. You say that you want to see her as a friend, which was exactly mine case also. Even though meeting with her as friends were enjoyable, after a couple of meetings I started to miss the things we've done together when we were in a relationship. I'm sure it's pretty obvious that if you don't want to be attached to her in an emotional way you would have to stop contacting her, at least I think so. Beign friends, friends that often see each other isn't a good solution after a long relationship, it is rather toxic IMO.