Just looked at the full text on two sites and, in each case, it is presented as one complete poem not divided into any stanzas/verses so it looks like just one.
Just type Browning Fra Lippo Lippi in to any search engine and follow the links. I reckon you'll come up with the same answer.
that is what i did, and on the version i have it is four stanzas, but i wasnt sure so i looked it up on the internet to see and it was one whole thing so im quite confused really :( but thankyou anyway :)
Can I suggest this is one time the internet may not be the best place to look. Find a copy in your local library and see how Browning published it, rather than how other people have set it up on the web.