NatKat
So you see your ex in public with someone new and you get that sharp pain in your chest or punch in the gut feeling...what one card would that be? 3 or 10 of swords? Or another card?
Would 10 of swords be more if he/she planned on running into you with someone new on their arm and intentionally meant to hurt you?
I see 3 Swords as the normal pain of any break-up. i see 10 swords as a devastating betrayal ... like you see him in public w/ somebody else and you guys are STILL MARRIED or yeah ... like if he was intentionally trying to mess w/ you above and beyond the normal discomfort of accidentally running-in to your ex.
Really it is your call. Every reader assigns their own meaning to cards ... that is just my take on it.