Generally speaking, the gift of a small amount of property does not need to be returned during the period of love, but the gift of a large amount of property is essentially an implied conditional gift, that is, an implied condition for concluding a marriage is attached; If the two parties break up before marriage, that is, the conditions are not met, one party still has no legal basis for the possession of the valuable property, which constitutes unjust enrichment in law and should be returned.
What has been spent depends on where it is used. If it is pointed out by both parties, there is no need to return it.