Curvy heart lines - the need to express feelings
Heart lines that curve up and touch the index finger (Big Heart) or middle finger (Passionate) actually have a NEED to express feelings. The straight heart line types (Hermit & Romantic Idealist) don't have this same need. It comes from a pressure that builds through the neurology of the curvy line.
For example, if you have curvy lines and find yourself holding back on expressing feelings, the pressure builds until you do. And then you do express and the relief is huge. You can move to the next level because you've "moved through and moved on."
And because these curvy heart lines are designed express, any holding back is counter to your innate design and isn't of service to you.