Hurt Betta and Goldfish , Help !!!

I had a betta fish who was healthy and happy when I (stupidly) decided that it would be ok to keep it together with a new goldfish in a two gallon tank. I thought the betta would only be aggressive towards other bettas. They were doing fine for almost a month and then when I woke up this morning I noticed my goldfish had red spots on his body and my bettas fins had been nipped all over the place. It basically looks like the webbing is gone from the long fins and what is left are more like pink strands of fin. Can this heal? How can I tell if there is other damage? What should I do about my goldfish? So far I have put them in separate bowls, but I am pretty new to fish keeping and dont know how to help my betta, she looks worse off than the goldfish.

Help me!
Cassie