I think you just have to do Matt's route without getting to the point where he blackmails you. Just be on his good side and do whatever he wants while doing Kate's romance route.
I am Doing That And still didnt get That hmm
I mean, it worked for me. Although, I made sure I was only doing his route and hers.
ohh I Guess I cant get it cause i'm on Violet route as well, okay Thx for. The help
do matt and kate ever talk to each other?