In addition to them spending lots of time together, in his drama desk speech he thanked Michelle and mentioned teaching him about wheelchairs. So that pretty much told me that yes, they are dating.
"If there was a Mount Rushmore for Broadway scores, "West Side Story" would be front and center. It snaps, it crackles it pops! It surges with a roar, its energy and sheer life undiminished by the years" - NYPost reviewer Elisabeth Vincentelli