If that's what I'm doing, and I think it is.
I've done it for years with diets, persisted for a while then started on a downward spiral. With jobs too, if I'm doing well I deliberately stop making an effort.
Now after years of awful relationships I've finally met someone who makes me really, truly, happy. And I'm screwing it up and I don't know why, other than I seem to feel I don't deserve to be happy. Or that everything will go wrong anyway 
Does anyone else understand this?