cut a strip of paper by its length
( the length must be at least 20cm, the width can be any size as this will only determine how big your heart turns out in the end.)
fold a triangle on one side of the strip
fold the triangle you just made down, and repeat step 2
keep doing this until you get to the end
once you get to the end and you have a bit of paper left tuck in the paper in one of the slots made by the triangle
(if you are finding this bit hard you can snip of the corners and then tuck it in)
to make the shape of the heart use your thumbs and push into the middle of the triangle with the longest side, with your nails.
to make it look like a bit more like a heart you can curve the corners.