Game closes after startup

After I go to launch Garry’s Mod the game shows the backround for a good 5 seconds before closing without any warnings at all. No “hl2.exe has stopped working” or anything.
Game ran fine an update or two ago and shouldn’t be anything directly from my computer as it’s very well capable of running it fine as it was before.

Anyways any insight on what my problem is and how to fix it?

Try renaming your garrysmod folder to start with. This way we can rule out any user error.
If this fixes the problem, try removing addons or things you’ve messed with recently.