Don't know of a support group in Perth but just letting you know I am currently going through the same thing as you are and it's making me so depress and lost.
My parter has just asked for time alone and I feel this is the worst as he normally would say a little hi or bye and check in with me and this is the first time where it is total silence and he has shown some contempt for me and for some reason, this silence is killing me as I really care for him ,and also I am so use to talking to him everyday , I feel a bit lost.
I also have noone to talk to as my friends has these unrealistic high standards of what makes a good partner. The last time we met , their drilling made me so frustrated I cried because it was so frustrating to answer their repeated questioning about our relationship when I was honest about his issues and had already answered it twice earlier that day. One friend even said I want to know your relationship but when I did in the past , he often gets distracted because talking about depression isn't something he wants to talk about, so why would I want to confide in topics I know he won't really want to talk about.
So I hope this give you some sort of support to know that you aren't alone with feeling like this. My emotions and mind has been so irrational I feel a little crazy myself. Trying to be patient and calm is so difficult that I have even logged out of social media so I don't find myself checking to see when he is ok again to talk.
I don't know how to sort this out or even advice you, but I guess just talking about it with people who really want to listen helps. I feel a bit better already just writing this to you, so feel free to write back and hope I can do the same for you . To be your eyes and ears. Perhaps that is a start.