"Not too much should be made of Mahler's encounter with Siegmund Freud"
My understanding is that Freud was very impressed with just how much Mahler comprehended in a short amount of time. The whole business about Mahler substituting his mother with Alma (wanting Alma to suffer as his mother had) - that must have been a pretty big breakthrough for him. Furthermore, Freud assured Mahler that the very things that he was feeling so insecure about, were the very things that attracted Alma to him in the first place. Frankly, I would interpret that things improved greatly between Mahler and Alma, after Mahler's encounter with Freud. Of course, the damage from her dalliances had already happened. But if Mahler hadn't received such insight from Freud, it's possible that Alma might have walked out much earlier. She picked-up on the change in him immediately.
My problem with this movie is this: why, "on the couch"? There was no couch. Freud and Mahler discussed everything while walking around a Dutch city (Leyden - was that it?). They barely had time for each other, but thank goodness they did.
Also, what a huge surprise: the Adagietto from the 5th symphony.