Yes girls do seem to need to have some wild girl period. Maybe not all but most seem to need some period where they experiment.
My ex was never the type of girls that I thought would want to, and indeed either did she. But it has turned out that she does. Although not her direct reason for breaking up with me, I certainly think she in her mind feels she needs to be young for a while. Something she missed out on for various reasons.
And they don't go, have fun and then come back. Doesn't work like that.
And yes you would be a mug to think it worked like that and indeed wait. So don't wait and don't even wish her back. Move on and enjoy your own life. After all that seems to be what she is doing.