Being objective about relationships is easier said than done, Clicker. Anyway, at least you can say to yourself you were willing to give it your all. You are far from the first person who knew s/he *should* end a relationship but decided to try again...
Learn from this experience. 'Trying' is admirable only to a point. Make sure you know the difference between trying with a hope of achieving success and not letting go from fear of failure.
Second thoughts can generally be amended with judicious action; injudicious actions can seldom be recovered with second thoughts.
--Cyteen by C.J.Cherryh