  We investigate new and archival 3-5 $\mu$m high resolution ($\sim3$ km
s$^{-1}$) spectroscopy of molecular gas in the inner disk of the young
solar-mass star EX Lupi, taken during and after the strong accretion outburst
of 2008. The data were obtained using the CRIRES spectrometer at the ESO Very
Large Telescope in 2008 and 2014. In 2008, emission lines from CO, H$_{2}$O,
and OH were detected with broad profiles tracing gas near and within the
corotation radius (0.02-0.3 AU). In 2014, the spectra display marked
differences. The CO lines, while still detected, are much weaker, and the
H$_{2}$O and OH lines have disappeared altogether. At 3 $\mu$m a veiled stellar
photospheric spectrum is observed. Our analysis finds that the molecular gas
mass in the inner disk has decreased by an order of magnitude since the
outburst, matching a similar decrease in the accretion rate onto the star. We
discuss these findings in the context of a rapid depletion of material
accumulated beyond the disk corotation radius during quiescent periods, as
proposed by models of episodic accretion in EXor type young stars.
