How much of your heart should you give to someone?
A narcissist might probably say 1%.
As they love themselves more than everything else in the world. Making it seem as though the world should only revolve around them, and the people around them should cater to all their needs. When they love, it is mostly out of convenience. 'If you can fit into my busy schedule, I'll keep you. But if you can't, I'll find someone else who is able to do that.', giving them sufficient space to do their own stuff without having to invest much effort into the relationship.
A romantic might probably say 101%.
It is unrealistic and yet it shows their devotion to the relationship. How they are willing to put their everything in without a fear. They are extremely cheesy and sometimes can be seen as a person who is way too extreme. But, all the sacrifices that are made in the name of romance will not matter, as love is what fuels them.
What about a pragmatist?
The answer will probably be it depends.
They will weigh the pros and cons of this relationship and the future outlook before deciding how much emotions they want to invest. They are careful with the anything they do, and will not allow anyone to have too much of their heart. This ensures that the relationship will still be a stable one without the risk of a heartbreak that cannot be repaired.
And what about the rest?
They will probably not know how much have they invested in the relationship until the pain starts. And at that time, nothing probably matters anymore.
