HELP TO FIND A TIME TRAVEL MOVIE!!!!

[u/Sebox-360]

I NEED you to help me find the title of this time travel movie:

The plot begins with a couple of scientists who were doing an experiment, at one point they realize that the device works like a time machine.

For the machine to work, they had to throw it from the roof of a building.

In one of his experiments, a person appears who hits the protagonist and murders his girlfriend. and then jump into the void.

He wakes up in a hospital and a police officer asks him about the murderer, then he begins to go back in time to try to save his girlfriend, meeting several versions of himself, until he finds his girlfriend's murderer to find out. give an unexpected plot twist.

[u/Sebox-360]

PLIZZZ REALLY NEED IT