Well, it turns out that Niall falls for Steph and does his best to try and convince her to break it off with Max.
At the end of next month, Steph and Max get to the wedding day but something happens (I don't know what, the producers are playing that close to their chest) that stops the wedding and OB comes back to convince Max to go to New York with him, which he does.
It didn't say what happens to Tom, but indicated that Tom wasn't going to NY with them, which I find odd, despite everything, Max has always put Tom first. It doesn't say why OB is going to NY without Summer either.