when buffy told angel of her "feelings" for riley, she was lying, and that's common knowledge.
and as for moving on - they both moved on and who ever said they couldn't? they were growing as people, as individuals, they led separate lives, who cares as long as they had a joint future in mind? and i'm the world's biggest b/a and you'll still hear that from me - too many good storylines would be missed if they stayed together. for the sake of both shows, and themselves, it's good they split for the time being. they still loved each other, they still saw a joint future, even after years apart, so what is so wrong in leading saparate lives for a while? i'm not saying in real life that's the way to go, but for these two individuals, it *was* the way to go.