Leon just got the truth from Annette that you are not part of the F.B.I. you work for someone else, you create a scenario of meeting Leon on the way to the city when Leon has just been appointed as a police officer and is going to a new police station. And Reon trusted you, helped you and then you became partner worker Slaughter all the zombies in Raccoon City and get the G-virus sample. But it turns out that you betrayed him, even though Leon secretly had feelings for you and he felt that you were the same. But he was wrong. You only use him to get samples of the G-virus

When exiting the building after getting the truth from Annette before she died, Leon meets you outside on the bridge. But the bridge is fragile and beneath you is the lake. You asked for the G-virus sample that Leon got

Leon: "No, She claims you're not the F.B.I"

You then sigh, now Leon knows, then you point the gun at him "Oh Leon, Why couldn't you just hand over the sample?"

Leon points his gun at you in return Leon: because i realize, as much i want trust you, i did'nt!"