Long story WTF, Grint stated the following in a recent interview:
Huffington Post: If J.K. asked you where you’d like your character to be off to, what would you say? Swing for the fences, or go as crazy as you’d like with what you’d be doing in that universe.
Grint: [laughs] I would expect Ron has probably divorced Hermione already. I don’t think that relationship would have done very well.
Evanna Lynch (Luna): What?!
Huffington Post: Like living in his own, low-rent bachelor pad?
Grint: Yeah. Exactly. He’s living on his own, in a little one-bedroom apartment. He hasn’t got a job.
Lynch: Don’t say divorced. Say they’ve split up. They can reconcile.
Grint: Yeah, they’re briefly separated.
Huffington Post: Ron is on Tinder doing horribly…
Matthew Lewis (Neville): Living in a one-bedroom studio apartment all alone, doing nothing. He lives in Kings Cross, right in that area.
It’s kinda sad. Like who’s got a chance if these two can’t make it? No one.