What would happen if stringing along people was punishable by law?

I'm talking about those that purposely string along others, waste people's time, future faking, make someone waste money or years for nothing, etc.

What would happen if a new law was created and the consequence of doing that to others was punishable by 5-10 years in prison and a fine?

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Imagine this was made into a law. Someone tries draining someone's money, they get punished and fined the same amount they took from that person. Someone waste 8-10 years of a woman's youth, keeping her as a forever girlfriend with false promises of kids, that person gets jailed for 8-10 years (the same time she wasted on him) and fined for emotional damage.
What would happen if stringing along people was punishable by law?
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