I think the flashbacks were there to show that luke and June never had a fairytale love, so the chances of their relationship surviving are slim. I'm sure in other flashbacks there was a hint that he was just sort of OK. We know moira isn't a fan, but then, how many of us aren't fans of friends' partners? Can't remember if her mum was.
I remember luke not being that bothered by June having her back cards frozen, but that could have just been to illustrate how men weren't initially affected.
Their experiences will also be so different now. Will luke feel guilty that he effectively came out OK? Will he resent June's drive and resilience? Will he cope with her ptsd, because that, surely will kick in?