If you had taxes withheld for the state where you were not a resident, you will want to file for that state as well.
You could get a credit from your state of residence for the taxes you paid to another state.
Also, since you had taxes withheld in that state, you should be getting a refund.
If you are filing a Non-resident tax return, the taxes paid to that
state should post to your Resident tax return
of the state of which you are a resident.
In order to get that
to flow correctly you need to do your
Non-resident return first.
If you've already started the process, delete all your state returns and start again
with the Non-resident return first.