jacob doesn't just wander around as a human near the edge of their "territory", unless i'm mistaken, and he'd need to become human to go into his house (wolf!jacob doesn't fit in the house iirc). he's more vulnerable as a human, it'd be a lot harder to grab him as a wolf (plus, at the cullen house he has backup and in la push he doesn't, unless he takes seth and leah, which leaves the cullen house completely unprotected by wolves)

ETA: i'm not arguing that jacob isn't an asshole, just that there is a logical reason he wouldn't go home. =P