Biggest regret I am trying to stop repeating

I regret putting myself last on everyone's list... especially when it deals with love. Subconciously, I put myself lower and lower on their priority list until I eventually push them far enough to where eventually leave... why? I can handle turning my back on them... but I couldn't live if the one i love turned his back on me. I already tried it once with my current boyfriend... now i am in the process of fixing it...