He tried to bring it up several times, between each step of the audition process. He even considered not even going to the audition (which would have been a terrible idea) when talking to Marten.
He's been thinking about this from the beginning. He just can't talk about it with her until she actually decides to talk about it.
(I just reread everything with the two of them in it from like, 2600 on. I had actually missed how many times he tried to discuss it.)
I'm sorry, I didn't mean to imply that it's all on Angus, only that he was in the best position to make this play out better. Now, my memory of their exchanges about this isn't all that fresh, but what I remember could also be seen as examples of Angus jumping on every opportunity to enthuse about this awesome opportunity after perfunctorily checking with Faye and taking her assurances at face value. I think that interpretation is consistent with the way his character has been portrayed so far--a good dude who kinda needs people to take care of their things on their own end make things clear and easy for him as well as for themselves by telling him when he needs to think.
I don't mean that as criticism, it's just another way to approach relationships. However, I don't think his way of doing things is the only way, or even the best way. For example, he could have taken an approach that simultaneously allows for the possibility that Faye's always clearly meant what she said and the possibility that she's been trying to put a brave face on things. He could also have set things up for this conversation earlier, because, believe it or not, you can actually force or help people to have--or at least prepare to have--conversations they apparently aren't ready or willing to have. You can when you need and want to. Esp. when you're in a committed long-term relationship with that person. But, in order to do so, you have to be willing to have that conversation yourself, you have to understand and accept that people sometimes "lie" to themselves and to each other, you have to have a sense of what
might be going on in eg. your partner's head and you have to use that sense deliberately rather than tricking yourself into accepting the most pleasant view of things. It's about using your good judgement, and I don't think Angus has much inclination to use what good judgement he may have. I don't think Angus's psyche works like that, which is why, when the moment of truth finally arrived, he acted as if the thought of Faye having had difficulties with this had been completely wiped from his mind: "You're not being very supportive. This is my dream. Can't you just be happy for me?"
Now, I get how he might be hurt and upset by having his joy turned into sadness and guilt. It's possible that I've forgotten some crucial comic where Angus's behaviour clearly refutes my characterization of him, and I'm not particularly invested in making him out to be a tit. Right now this discussion may be moot anyway, if Faye's really going to just end things, but I still have hopes for their future babies
even if they don't have those babies with each other. I think these two can "fix" each other, one learning to speak up, the other learning to listen properly, and both learning to fight for love.