I dont want to lose her and if that means I can only see her as a friend then I need to move beyond these feelings.
Could you be giving yourself a time out? Like telling her you need a little space to get over the break up first. Make a friends-only date a month or two out to catch up. Maybe just coffee at the bookstore for an hour. No contact til then so everyone can heal.
Then you can catch up on the goings on since the time out and rebuild anew as only friends after having had some closure.