An open ending, or I would say it a prologue ending (an ending that is a prologue of something, not an ending for a prologue) is indeed annoying. If it's because it's axed, then it's a shame, but giving a closure will do better a lot.
Well, at least, make them meet each other like in
or maybe give them a final moment that indicates that they "may" be together but it's off screen like
. I don't mind whoever he ends up with.
But heck, I WISH THERE WAS MOREEEEEE!