I think eventually Angelus would have made his way to Sunnydale to go after Buffy. I don't think he could resist tormenting her if he had the chance. It's obvious he still has somewhat of an obsession with her since Angel still loves her, so I think he'd definitely exploit that. As for whether or not Buffy would go after him if he didn't seek her out, I think she would. And I think she'd want to prove to herself that she could take him out this time before anyone she loved got hurt.
white avenger;1089582 If Angelus ever returned to the hellmouth said:I don't know about this. I mean, he could have left town at any time during S2, and he didn't. The only reason he stuck around was to torment Buffy.