TO

Y/n is bestfriends with Astoria Greengrass. Mattheo Riddle and Astoria had a thing going on at the start of the year, eventually Mattheo and Astoria stopped talking and Mattheo gets with y/n. a few months into the relationship, Mattheo kisses Astoria at a slytherin party, y/n finds out that night because she sees them kissing. She is the other woman