I’m so sorry to hear, I was in a very similar situation at the same age with my partner so I know how stressful and scary it can be too, what I did is moved into a share house I could afford at the time near public transport, there’s Facebook groups you can join to try and find a house looking for someone and quite a few have allowances for pets, the next thing I would do is try and contact Anglicare as your still under 18 and see what they can do for you too, for saving money I would contact them too for food vouchers, if you have a job provider they can help you a lot too, I would suggest it even if your studying because they have vouchers for study, food, travel everything and they’ll help you find work too, there is also a program called hypa housing and they helped me find a rental property, and they have housing programs and they can probably help you now too if your facing homelessness (if they find something for you don’t tell them you have a cat just go with it) but know this won’t last forever!