I think it would be something to think about since you are both mentally unstable. It could work out great depending on your connection, but it could also leave you heartbroken. Maybe tell him you find him interesting and would like to get to know him better outside of IP and see how he responds. I had a crush on a guy in IP and added him to Facebook after I was discharged but I ultimately decided not to pursue anything.

Do all hospitals in Australia let psych patients access the internet? That's great you can still post here for support.