I think it is sad that they split.They are really amazing together and perhaps if they looked back at the good times they had together,they would still be friends.
Answer on Do you wish Selena gomez and Demi lovato were still friends?
Yes. I think they got caught up in the industry and forgot how long they'd been friends. I think the fact Demi didn't have Selena any more is partially why she started feeling bad again and ended up in treatment.
However, maybe there is a valid reason why they aren't friends and we shouldn't have opinions if we don't know the facts.