It looks like your sentence was cut off. If you'd like, I can help complete it or offer possible endings based on common scenarios. For example:

- Andy was still traveling in Spain when he realized he left his passport in the hotel.
- Andy was still traveling in Spain when he realized he was running out of money.
- Andy was still traveling in Spain when he realized he had missed his flight home.

If you have a specific scenario in mind, please let me know and I can tailor the ending to fit better!