Oops...

That hurt just looking at it.

Maybe it needs a decorative flourish stitched over the top?

I bet you didn't just say Oops.

A moment of silence for our fallen comrade... 

This is a crime scene

I think it's kinda funny how we all cringe and cry at the sight of it, because we all know we have done it. A project goes perfect the whole way and we screw it up at the last step. I'm sorry it happened to you. 

I'm starting the project over, and will make them even better this time. Thanks for the comments!

Cut it on the other side and then both sides of the other shoe so it looks deliberate.  Show us pics of your finished second attempt (I hope it comes out nice!).

First use a syringe to inject some medium viscosity super glue into the slit and then press it with a roller after that make your decision.