In amours with

from The Collaborative International Dictionary of English v.0.48

Amour \A*mour"\, n. [F., fr. L. amor love.]
   1. Love; affection. [Obs.]
      [1913 Webster]

   2. Love making; a love affair; usually, an unlawful
      connection in love; a love intrigue; an illicit love
      affair.
      [1913 Webster]

   {In amours with}, in love with. [Obs.]
      [1913 Webster]