Where You Love Me

Shizuo has no idea what's going on. A second ago he was dealing with an Izaya who would laugh at him while he died. The Izaya in front of him now, with pure love in his eyes, can't be the same guy. How did getting hit by a truck lead to this? (In which Shizuo gets hit by the truck in Episode 25 and wakes up in an alternate universe where he and Izaya are boyfriends)