My wife filed an asylee relative petition (I-730)for me. I am waiting on the decision. Am I allowed to leave the country in the meantime?

Yes. The instructions for Form I-730 specifically provide for cases in which you are outside of the U.S."

"If your relative is living outside of the United States, he or she will be given instructions, if applicable, for fingerprinting and photographs by DHS, the Department of State (DOS), or Overseas Processing Entities (OPEs) (i.e., organizations who assist the U.S. government)."