Valentine Vitriol based loosely on a real life event

Splinter Sister
"Your sister sent this Valentine did she?" railed Carla scrabbling through the box of birthday cards previously received, searching for a sample of precious Perdita's pen.
"Here is proof she isn't the culprit!" she screamed, sending the card skimming across the room to where her husband of four years to the day sat. The card made contact, cutting his forehead.
"Ouch!" he yelled "you've drawn blood.!"
"I'll do more than draw blood. I'll draw your bloody affair for the world to see. How could you?"
“Carla, please try and remain calm, you'll see more clearly if you do” chided Chris wiping the blood from his brow. “She's obviously involved another partner in crime in this latest wind up.”
“I really wish I could believe you, you've been so tired and preoccupied lately, you can't blame me for thinking you've been occupying someone elses bed because nothing much has happened in ours recently!”she sobbed, uncontrollably now.
He tried to comfort her as he searched for why his sister would pull such a stunt.
“Maybe she is trying to drive a wedge between us” he spoke questioningly, crossing the room and picking up the torn envelope and card responsible for their row.
“I'll take a wedge and stick it up her backside if that's her game!” Carla cried, confusingly. “She likes me, doesn't she?”
That's the trouble Chris thought, bending to pick up the torn envelope addressed to her, wondering just how he would get the splinters out.
250 words