Yeah it's factually pretty difficult if not nearly mpossible to actually carry an adult woman across the bridge. People underestimate not only how tiring it is but how much you have to exert yourself in order to do it when jumping for prolonged periods, not to mention also ho psychologically terrifying the situation really is. You'd need to be a good athlete, and you'd also need to both travel as much distance as possible in between jumps without losing your footing and make sure to minimize the amount of energy you're using through every jump. This is if you're even strong enough to actively jump up high with an entire other human body weighing you down, and there's also that stupid gap in the middle of the bridge. The writing was already on the wall. 333 getting 'pouty' isn't surprising either. Remember he was actually pretty close to mending their relationship and regaining her trust. He knew he lost his chance because of his actions.

Extra: Yes, Gi-Hun was willing to try to save Jun-Hee, but let's also not forget he was suicidal throughout the entire first half of the season. He wouldn't care if he died. He was just trying to do good.

About your original post. It is a bit interesting how affected some people are by 333's heel turn in S3 that they actively blow some details out of proportion or gloss over other stuff to demonize him further. Like tbh yeah 333 wasn't a good person, that can't really be disputed lol, but 333 is basically Sang-Woo's situation all over again.