Validating Steam Files

I was playing garrysmod, wanted to play some TF2, so I opened up the main menu and tried to save my game. It crashed my garrysmod and I’m sure it didn’t save either :frowning: I got a message from steam titled “Validating Steam Files - 100% complete” And it said “All files successfully validated” Its not a message from a friend or anything. I don’t know why I got it, and Ive never got this message before. Any ideas? What does this mean?

It was confirming all your files were correct

Ok, I didnt know if it was related to the crash or not. Thanks