I think we hit the jackpot. There are obvious insecurities here, and it seems like our "female ex" needs to get happy with herself first before she is able to find happiness with another. She's projecting the responsibility of happiness on the men she choses to be with. When one can't make her happy (chasing the elusive ring), she goes off to another. Again, it's the "Knight in Shining Armor" syndrome.

She's got to "rescue" herself first, then she might find what she thinks is missing in her life.

I still think Chef's better off ignorning her attempts at finding a way back in. It'll only lead to trouble.