I'm not sure if we will have a second chance with Jade, but at least we should be able to explain why we didn't meet her as planned (then she could understand us and give us another chance, or maybe she realized this was a mistake and has already shut us out for good). But with Cathy the doors have been definitely closed (I can't possibly imagine a new convo in which we tell her 'hey, I'm having second thoughts and now I'll love to keep this going' and she agrees to that) and automatically excluding us from her path seems a very odd choice by DPC, especially when we can keep banging and making moves on other girls. I can guess they come as a kind of pack and somehow related to the 'bang a teacher' task, but in a non-M&J route you can choose if you want to fool around with both of them, only one of them or neither of them. So I don't really get why is so "important" to close Cathy's door when Jade is not available anymore. Because being with M&J can't be the key factor here.
I guess works in progress are sometimes a hit and miss, especially with secondary paths that are most likely written on the fly, and right now this feels definitely like a miss.