Make a comic of two people over the course of their lives together, but in each panel show one person saying "I love you"

So, like when they met as children and they were naive

Then as teenagers as a confession

Then proposing

Getting married

Getting pregnant

Having a child

Growing old

The one who doesn't say anything on their death bed

Then the one saying I love you sitting at their grave in silence

Then them maybe about to commit suicide over the other's death,  whispering I love you as their last words but their lover comes back as a spirit to stop them, comforting them and finally saying in the comic "I love you too"