O.C.D.D (Obsessive Compulsive Douchebag Disorder)
You can't let go of a lover who's a complete disaster. Even when they lie, steal your money, and dump you in the street, you still take them back like they're your long lost soulmate.
'He stole my wallet, but he said he loves me.'
'He left me in the rain, but I still took him back.'
'He said he'd never cheat again. I believed him.'