First off, WELCOME!!!
Second, CALM DOWN!!!! It isn't the end of the world. Many people make the mistake of not quarantining their animals and 90% of the time nothing goes wrong. But sometimes, things happen which causes both of the animals quite a bit of harm.
I can already tell that you sound like a responsible keeper who is trying to do the best for your animals. I have these moments too sometimes...brain farts...lapses in judgment, whatever, everyone makes mistakes.
As soon as you can, set up the male in his own house and try to keep him in a separate room from the female if possible. Keep them separated for at least a month, longer if you can manage it.
Right now, you could try to create some kind of divider in the tank you have so they at least have their own space. Make sure not to use any tape for this though. BPs have a tendency to stick themselves to tape :/
Now, If you happen to have $20 to spare, I can give you details on how to set him up in his own fancy storage tub. I understand money can be tight sometimes.