Is this frame safe to ride?

I didn't hit anything, read my first post. The chain slipped off, and because of my own stupidity/inexperience I tried braking with my foot on the front wheel..it worked to slow me down quite a lot, until the wheel locked and I flew off..

Nothing was hit, just the fact that it stopped suddenly put so much pressure on the frame it bent..

Why did your chain slip off ? Too slack ? Worn sprocket ?

You really could do with finding out why......