I am late seeing this - I have been traveling lately.

I would suggest "flutter." In English, a bird or butterfly flutters, and the movement before the eyes, although endearing and adorable at first, could be annoying after awhile.

You could say, as suggested by Kalinka Vinnie, "I wanted to marry her, but then I imagined how she would always be fluttering about in front of me, here, there, everywhere."

The meaning is not as fast as "flash."