The thinking is not irrational, just not helpful. Sure, it could happen but it hasn't yet and it's impossible to solve or fix things that haven't happened yet :-)

What has happened? Your mother sent the balance of what was owed. So you're okay for the moment; if worse-comes-to-worse, you can give the Super that money and buy yourself a little more time to make your escape :-)

Can you take that money to him now so he can see you are "trying" and explain your ex got caught in town because of work so isn't home yet, etc.?