Hi,
yes it means that they are happy.
You should'nt let the fly trap flower to much or it could die.
After all,it takes a lot of engery.
Adrian

Generally speaking, this is a good thing. Only a VFT will be too stressed out from flowering.... if it was a storebought, neglected, underlit, no dormancy plant. Then it's a good idea to cut the flower. Other than that, you're doing quite well!