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If and when that happens I would certainly trust my children to do what is best for themselves and of course there would be no question of emotional blackmailing ever, instead I would try and see their view point and offer any help and advice if asked for ...
I don't believe in live-in relationships. It is not a sacred relationship in any country. It is better to make friend, get marry and then live together. Married couples are respected in every countries and in any society.
Relationship is in fact the name of understanding and vow to live together forever, if a live in relationship can last for ever why not? The only problem with this kind of relationship is that it has no legal value unless registered.
Personally I do not favor live in relation for long term relation. But the grown up children have their own decision making capacity. If required, I shall advise but leave the issue to their own discretion.