Missing Piece

123456
Across
  1. 3. First half of ‘___self and I'
  2. 4. Not me, but ___
  3. 6. Title for a romantic partner
Down
  1. 1. Last name of the 12th U.S. President, Zachary
  2. 2. A verb that expresses possibility or willingness.
  3. 5. Shakespeare said ‘To ___ or not to ___'