And then buy an entire new razor that comes with a set of 4

Granted it doesn't feel the same as a new blade after a couple of weeks but I've I had the same blade on my razor for like 2.5 months now.

You have no idea of the pain. If I use a blade for more than a month, then it starts tearing at my skin and is absurdly painful.

Replace your blades regularly for a clean shave and better skin.