why is it so hard seeing your ex try so much harder with his new girl than when you were with him.

You need to block him everywhere. It does hurt, but it’ll only hurt longer if you know what he’s doing.

It's possible this is just a perception you have. He is still the same person, if he treated you bad it's very likely he'll do the same to her

Block him

the reason it’s hard even if you don’t have feelings for him anymore is because you’re wondering why he couldn’t do it for you i know how you feel he probably is trying harder as not trying hard lead him to losing you however it will probably be short lived and he will stop trying after a few months