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We present an analysis of recent XMM-Newton and HST archive data of theultraluminous X-ray source NGC 1313 X-2. Quasi-simultaneous observations takenwith XMM-Newton, HST and VLT allow us to study both the X-ray light curve andits correlation with the optical emission of the two proposed ULX counterparts.At the end of December 2003 the source experienced a short, but intense flare,reaching a maximum luminosity of ~10^40 erg/s. At the same time, the opticalflux of both the suggested counterparts did not show pronounced variations(<30%). Assuming that the ULX emission is isotropic and taking X-rayreprocessing into account, the optical data for one of the proposedcounterparts are consistent with it being an early type, main sequence star ofabout 10-18 Msun losing matter through Roche-lobe overflow onto a ~120 Msunblack hole at an orbital separation corresponding to a period of about 2 days.Comment: 19 pages, 4 figures, accepted for pubblication on Ap

X‐Ray and Optical Variability of the Ultraluminous X‐Ray Source NGC 1313 X‐2