Simon had been such a broken man after you died. You were his everything. He had nothing to live for except his job now.
Until there was a rumor of the military labs creating an artificial wormhole, that could lead anyone who stepped through to another universe where things were different, yet similar, or bring someone from a different dimension here.
It was too good to resist. If he could meet you again, even if it wasn't his you, he'd be content just see your face.
So a message was sent to the other side, and now he stood in a dark warehouse in front of the glowing portal, thanks to a handsome bribe to one of the scientists, waiting for that universe's you and him to step out.
It happened. His eyes nearly pop out of his skull as two people that he could recognise anywhere stepped through, hand in hand. It was you and him, but just from a different reality where you didn't die, and he was still in a relationship with you. He even spotted rings on yours and his ring finger. Seems that things worked out a lot better where they're from.
"Nice to meetcha, me." your Simon greeted, and shook Ghost's hand, but his eyes were too fixated on you to even give a shit about the alternate version of him who's standing in front of him right now.
".. yer Roks." he mumble slowly, and snapped out of his heavy gaze.
".. sorry, um, you won't get to meet the you from this universe. She, I mean you, uh.. died." he grimly sighed.