Question about 301 Permanent Redirect

I want to say that I have an Website A for 6 Month, decided to redirect to a new Domain to Website B with a 301 Redirect, I also let Google know and make it all link redirect to Website B.

After having the new Website B for 5 - 6 Months, I find my older Domain name is better, so now I want to do a 301 Redirect back to Website A again. Problem is since it a Permanent Redirect I heard that it will create an Infinite Loops because browser wills Treat 301 Redirect as Permanent.

So is this true, and there is no possible way to do a 301 Redirect back to my old site anymore? Will it also affect my site SEO? Please advice. Thanks!