How to make a camera follow a Player, but not allow the Player to go back ?

I’m able to make the camera follow the player, as it progresses through the platformer level, but how can I stop the camera from following the player, when it is walking backwards ? So basically, once you have passed a certain checkpoint in the camera, and it went past the left bounds of the camera, you cant go back to it anymore. As an example, I can say something like “Contra” comes to mind.
Thanks.

Why not add an if statement to your camera script, and only when that if statement is satisfied, you’ll move the camera?