Some thresholds, once crossed, cannot be revisited.

Sounds to me like you cheated & that's a deal breaker for her. Sorry. Her affection during your talk was probably her trying to sort things out & also remembering old feelings. Ever heard of ex-sex? The sort that split/divorced couples have in vulnerable moments? Doesn't mean they want to get together again, they are just temporarily confused.

Mbe I'm wrong, but I think this one is gone. You might as well not prolong your pain by fighting it. Try to learn your lesson & move on.