My sister married a Hell's Angel 40 years ago, he smoked, drank, gambled, went down the pub with his mates every night and went off fishing every weekend.
She soon started nagging him into changing his ways but he refused pointblank and said "You knew what I was like before you chose to marry me, so i don't see why I should change now!", and he just carried on.
I couldn't fault his logic and I always liked him (so did everybody else, he was a popular nice friendly guy).
Their marriage creaked on for a few more years until she finally decided to divorce him but he took it in his stride and married another woman 5 minutes later, but no man would touch my sister with a bargepole and she's been on her own ever since..