i just don't want to forget what andre holland, who plays kevin, said about the ending:

"In my mind, I don’t know whether they’re going to end up as a couple, but they’re going to live authentic lives. I have this image of them walking along with Kevin’s son and teaching him, either overtly or experientially, about what masculinity is and what it means to be a man, in all the variations that are possible. That, to me, is the magic of it, that there’s a young boy in the world who will grow up with a different idea of masculinity than either of them had."