When people show you who they are, BELIEVE THEM!
Ideally, we should believe them the first time - as Maya Angelou famously said - but some of us need to see it over and over, and then we finally get it...
I held out hope for my alcoholic ex way to long - well, really 5 minutes would have been too long, as it turned out... But hey, I got there eventually. And he ultimately drank himself to an early death. But thank god I wasn't there to watch.
Take care of yourself, Sad. Maybe start to think about what would make you a HappyPartner? Make a list of all the attributes you would like and deserve in a mate and start manifesting!