Ha our cat is obsessed with DH. In fairness, DH adopted him a year before we met. But yes, he follows DH around everywhere. If I'm home at night (I work nights) he sleeps at DH's feet. If I"m not home, he sleeps curled up next to DH.
He meows at me if I come into DH's office when he's curled up on his lap. I think he thinks its "their" room.
On the rare days that DH is away at night, the cat will meow/howl at random hours of the night because he misses DH.
And yes, he HATES closed doors if DH is on the other side.