scubadiver: have you been living together in a Common Law relationship under the same roof for 2 years straight?

You note: we've had problems for the last year and a half. Additionally, she has returned the Ring. Hence, you are no longer in a Common Law relationship on course to be married.

As PhD suggested; "I don't think alimony is going to be a major factor for you"

Go your separate way and move on.