Wondering if you've gone to Alanon or sought other support for yourself besides SR? There is something to be said for face-to-face contact; it's just different from being online. That might get thru to you in a way that things at SR just haven't. The fact that someone posted a link to a post of yours from a year ago that is essentially the same place as where you are now would indicate that you're kind of "stuck", like a broken record playing the same song. Are you getting tired of hearing it over and over?
Here's a link to Alanon to help you find a meeting:
http://www.al-anon.alateen.org/
I'd also suggest that maybe you take a break from any romantic relationships until you figure out some things about YOU--replacing one bad situation with another very similar one, apparently within a very short time after ending the first one, doesn't leave you a lot of time to get in touch w/yourself, heal and grow. I'm sure you know by now that no one else is going to make you whole and happy--like they say, "happiness is an inside job."
Wishing you strength and clarity.