Yeah man, Matt's speech was brutal.
I get it, they were all fucked up and damaged people before. But, assuming Nora's story was true, to go through all that and come back, I can totally see how she would shut everyone out like that. I think she was happy to see him, she did go to the wedding, I think she was just freaked out because it had been so long and he was acting so weird.
I never considered that Nora may have lied until later. It's interesting to consider that interpretation. I think she was telling the truth, partly because I watched the "behind the scenes" thing after and partly because I just like that story better. But it's interesting to think about.