Of course it doesn't make sense here. If you count regenerations separately, I know of at least 5 people from 7 different points in time from our universe alone. People pop out and back in with no memory of their previous time here. The dead don't stay dead. This place is a mess.
You're not gonna ruin things for me. And I'd regret not taking the chance to meet another you. Might start a list, see how many I can catch. Like Pokemon.