Same situation a while back. Together with her for 5 years. She wants to see what is out there (gives me the ol it's not you it's me, I don't know what I want) She does her thing for 7 months, I just stay single and date around. She calls me out of the blue, i'm so sorry i want to be back with you. blah blah blah.
I say, we can see eachother and kick it, but nothing serious. I keep my guard up and my distance, we go out and kick it, hit it, and then 2 weeks later, it's the same ol song and dance. Just remember, once your trust is broken with someone, they will do it again. Trust me. Find one that will be yours, and knows what they want, kinda like yourself. They are out there, just don't try and look so hard. It will come.