Why do I miss my loser ex so much?

Dated for about a year... I knew I could've done better. There were lots of people who said he didn't deserve me, said he was a loser. But for some reason, I still miss him now. I would take him back, over any new guy I see. He was possessive, crazy, older than me (but in some ways I felt older than him), but looking back, I realize I WANT it back. There were many other options I had, but at the end of the day, I chose him... I can't really put this dynamic into words.

Can anyone explain what's going on, or relate to this?
Why do I miss my loser ex so much?
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