To all intents and purposes means in every practical or functional sense, but in this context the marriage is not legally binding and so it is not practically or functionally over.
Context: He told her about his marriage which was still not legally binding, but was in every sense functionally over.
Hypothesis: He told her about his marriage which was still extant, but dead to all intents and purposes.

Given this context, determine if the hypothesis is true (Yes, no, or unknown)?