He is in high school so she can't handle it, as she thought he was at least in college. So they cut all ties, short time skip and she is now dating the senior, they even have couple rings and whatnot, she accidentally sees MC at a badminton court (she decides to take classes, even without him) but goes into hiding so he notices but plays it cool, they still can't get over each other for what it seems, but the age gap is really something to consider, the last chapter shows her and senior being intimate, no explicitly shown how far they go but last panel shows the senior undoing her robe. so yeah at this point in time she is on the way of getting married to someone else, and it's really sad because you can see she loves MC despite the age gap but I guess her fears are greater than their love