im no expert in manga at all. but from what i've read this is by far the most realistic 'slice of life' i've ever read. 10/10 the characters, the development they have (i thinks is more than 10 years throu the manga), the fact that many things that happens to everyone are real things and they...
you gotta think that what haruto did, was the ultimate dick move on asuka. even if you kinda have feelings for your ex, you don't just go back to her while you love your current gf. even if he wanted to end up things with asuka, there were other ways to properly do it