I hope they accept each other at some point. It does look like they're moving in that direction.
Right now it's kinda unhealthy but I want them to pull off the healthy poly relationship that I've always wanted to see in manga. Sure, many manga have harem endings, but almost all that do have some sort of underlying jealousy among the girls, and that will never work out. I've yet to find a manga that has a poly end where the characters are both well-developed and not only not jealous of one another, but actually enjoy the other's company.