In the season 2 finale of The Flash, Barry is broken after he lost his dad, after he beat Zoom, so he went back in time to save his mom. And he succeeded.
Then he saw his younger self through the door, he smiled that his mom was okay, but then he disappeared.
So does that mean the season 1 finale events got erased? Because that means no earth 2, no Zoom, no earth 2 wells and no singularity. Why did season 1 Barry disappear when season 2 Barry saved his mom?