If somebody doesn’t seem to be themselves, you need to reach out to them and give them a chance to talk about it. You don’t have to be an expert and you don’t have to fix them. You just need to listen.
Try and keep it casual and not ask them a heap of questions. Just encourage them to keep talking with a few “uh huhs”, nods, and “Tell me more mate”. And when they’re finished, maybe just suggest they see their local doctor or ring a helpline.
It’s just a conversation, so give it a shot.
For some excellent advice on the how, when, and why of having a conversation visit RUOK?:
https://www.ruok.org.au/how-to-ask
Lifeline also have some great info at:
https://www.lifeline.org.au/get-help/i-m-worried-about-someone/
If you you’d prefer to talk directly with someone, you can ring MensLine Australia on 1300 78 99 78
Or for people under 25, you can make a booking to speak to a counsellor by calling headspace on 1800 650 890 or visiting:
https://headspace.org.au/online-and-phone-support/connect-with-us/
Mental Health on Tap 