Responses
It seems that that Asuka either doesn't have a family or has one that's too abusive to bear because from the conversation it seems he started getting sexually abused in highschool and then met one specific guy he thought he was in a relationship with, I don't think he's much older than 18 anyway but I honestly found his character too sad to get into the story. He went from one abusive situation to the other and is now in a fairly stable relationship but I wouldn't say he's healthy or healing at all...
Asuka said he was braking up with the guy he was believing to be a couple since high school, but the other guy he maybe had sex with said this was when he was a student, so it was even before the asshole guy? I thought student meant university but that wouldn't make any sense... So his hardcore phase was when he was in highschool?