Responses
You gotta think though, they were to together for 6 years and the MC just ends it with a simple sentence. No explanation no nothing, never gave any indication that their relationship was going south either. Seok-il is in love with the MC, that just doesn't change overnight or because they hurt you. The one acting crazy is the MC

Gurl this is not how you can take the MC back. Youre way too desperate dude, chill out and ignore him and let him suffer so he can realize what a loss you are. I feel bad for you but this persistence is annoying and pretending like everything’s fine isnt gonna win him back.