Your SO'd biggest Romantic screwup!!

I like today's Prompt by Mama M. It is your SO's biggest romantic screw up. I would like to say I have a funny story but I don't. We have been together on and off(more off) the last 10 years. this year will be the first year we have been together for Valentines' Day in while plus my birthday in August which is a big one. He better not screw up or Ill kill him lol.