Yan's manga / #age gap(180)

I don't think I've read a more annoying FML than this. And how is the ML tolerating everything? Age gap never bothered me as much as these characters do in such super obvious ways. If a girl is THIS insecure about her relationship, and if the relationship makes her anxious and crazy ALL THE TIME, something's not right. ML should have walked out of that hot mess and no one would have blamed him.