essentially, as it stands now there's loads of angry tension? he sort of dumped her in 5th year out of the wild blue in front of a bunch of her mates and just walked off without an explanation. it boils down to they were stupid and 14/15, she wanted all of his time, he didn't want to give it to her, he hated her girlfriends, hated everything, was just a general grouch about life because his mum is dying and she didn't seem to understand that (she probably did but he was also thick at the time). so 6th year they avoided each other at all costs but now it's back to them basically getting into fights and being snarky at each other and screaming in the great hall and being stupidly dramatic.