[knee jerk]

Relationships that last have certain built in elements:
You like the looks of one another.
You can talk to each other.
You can stand their friends/family.
You trust each other.
They don't make you wanna stab them.

Now the really important stuff is whether you have common interests.
Guys: if she likes comix in any form MARRY HER NOW!
Girls: if he digs some kind of shopping MARRY HIM NOW!

So is your girlfriend/wife or boyfriend/husband into horror? They don't have to be fanatics like you are but are they willing to go with you to see "the Grudge?" Are they cool with you staying up all night to watch "monstervision?" Do they have their own particular horror movie favorites?