Charleen, maybe you have some nectar sources for your butterfly? there may be pawpaws nearby and once the caterpillar becomes a butterfly, it will seek out its nectar plants.
Here's some info on the zebra swallowtail, sorry if it's a repeat.
http://www.butterfliesandmoths...
Then, maybe it will use another plant as a host? I know I've seen this happen before with some azalea cats that devoured a farkleberry tree... I sure was wishing I could find some wild azaleas growing nearby but I never have.