
its Weird he should know better than to leave him. he himself said in the fist story that the string of fate has nothing to do with emotions. all it dose is draw u in physically to ur fated pair like casually bumping into them all the time. but whether they fall for u or not is up to them. so why is the MC scared if the other guys meets his pair. if the black haired guys feelings are true (and that defiantly seems like it) then he wount fall in love with his fated pair. (please correct me if im wrong)

Yes, he said that to the MC of the first story but we do not know the exact timeline in which this story actually happened.... our views changes about significant and highlight events in our lives, so it is possible that this manga's plot happened before he even meet the first story's MC or in the middle of the first story.. who knows
Why do I stongly relate to a bar of soap TTvTT