Loving in the past

Why is it that I can't give up the feeling of trying again? With every past love that fell short of forever I still hold feelings for. I hold feelings to the extent that I find myself thinking "Maybe we should try again." I know that trying again will put us where we were before, which is having something good but not something great.

Is it I'm in love with being in love?
Are my romantic expectations of true love actually keeping me from finding it?