My roommate makes me so frustrated all the time

My (25F) roommate (28M) have lived together for a year now and we’ve moved house twice due to notices to vacate (we’re in Australia btw). He works in film so he works maybe once a week to once every three months, is on government payments, and refuses to get a casual job because “it’s a step back” from what he wants to do.

He pays significantly less ($1000 a month) rent than me because he is meant to look after my dog two or three times a week. He did at the start, but now he just flat out refuses or charges me. One time I tested it and left the dog home and my roommate just ignored him completely, making the dog piss and shit all over the floor (separation anxiety). Thus I’ve started sending him to daycare five days a week (costing $1300 a month).

Now my roommate has his girlfriend over from interstate for months in a row. She doesn’t pay a cent in rent and they use all of my things. I love her to bits and she’s lovely, but hearing them have sex at 2 in the morning and all round just noise in the house is pissing me off.

Our lease expires in a month and I’ve bought a house (so we’re parting ways thank fuck), but he’s packed all of his things already and just uses all of my kitchenware, bathroom things, you name it and doesn’t seem to have a concern with it. I’ve brought it up and met with minimal response “oh it’s only for a few weeks until we move out”. Bro doesn’t think I need to pack to move too??

We’re childhood friends and so it’s quite complicated. I’ve requested to split the rent three ways because of his girlfriend and he refused with no reason behind it. I even asked him to pay more rent given he no longer looks after my dog and his response was “well I just can’t afford more rent so no”. He often doesn’t pay his rent and he owes me two months worth, but he’ll spend $600 on a fry pan “just because”. He has OCD so if I even do anything slightly messy he goes off at me. Living with him (even though it’s going to be over soon) is making me so fucking depressed that I can’t even go to work sometimes. I feel like my whole mental health is ruined because of his entitlement. I can’t wait for it to be over because I’m genuinely so close to ruining my life and career because of how frustrated I am at him. I don’t know what to do given I feel like I’m being taken advantage of so hard with the rent and using my belongings situation.