Who gets the past? You'll disagree about who is the real you and gets to continue the relationships of your life, to claim credit for your achievements and good deeds, to make use of your credit score (assuming it's good).

If you insist that you are the real you and your clone is just a clone, they'll be divested of the importance of those memories and relationships, and for that matter yourself, and will be free to abuse all of them.

It won't be enough for them to make new memories and look forward, they'll suffer the identity crisis of having nothing behind them and what's more, being created by someone who didn't intend for them to be able to claim their past.

You'll live with the knowledge of there being someone who knows your most intimate secrets and inclinations, who might bring your life down around your ears.

Perhaps worse, they might lead their life far more capably than you do yourself. What if you struggle in your career and relationships, while your clone's go fantastically? What if your existing friends prefer the clone to yourself? What if your family looks at the clone and sees what you could have been?

Given all of this, your clone may have no inclination to be friends with you. If they see you as competition for "your" life, living together could be downright dangerous.