[He's the only one who can treat Venkman with patience and love! Also because they're dating

Ray listens intently, before snapping his fingers.]

You know, being a detective sounds a lot like ghostbusting! You get to see new things but most of them want you dead.

[He says, as if he's idly describing a mundane job requirement.]

Of course there's no mystery to hunting down ghosts usually, at least not to the level you're used to, I imagine.