Its a thriller film with some suspense from 2010-2015 (maybe earlier) and i remember only ending, its like everything ends well, but in last moment the hero sees himself in the window (probably clone or his other time copy) and the wiewer understands that everything is bad.
Coherence (2013)?
https://www.imdb.com/title/tt2866360
Source Code (2011)?
https://youtu.be/P8-GGkc2wGM?t=146
Unlikly, but what if? The end of the movie is the same. Soviet science fiction “Mirror for the hero”.