I'm also the same. I think the greatest value for her is the ability for the MC to forget about her and live on, and as a result of that, he can improve himself. He already did, partially. It's obvious that in the seduction route, Catherine is going to look at his boyfriend and compare him with MC. While it is obvious she is going to go with MC, I would love an option to reject her and say to her that the opportunity has already passed, and as a result of that, it will crush her spirit, at least a little.