Let's entertain that idea, if so why, and how? What's the point of living it again and again? And if we are living our lives again and again, then we don't have any choice, do we? We are just playing the same actions on repeat. When asserting something like this, you have to answer how, if not why. The existence of Deja Vu isn't that much of an evidence as there are theories that try to explain it more efficiently than what you just proposed.