3 of cups + 3 of swords = third party situation every time. That would be the sign of cheating for me. It might just be emotional cheating, but a third party getting involved in some way, shape or form.
Different decks show it in their own way. RWS has the three figures partying in 3 of cups, and Shadowscapes shows those sneaky-looking dancing fae. Put that next to the pierced heart, and you get the picture; there’s a crowd where there should just be two people.
The Wild Unknown deck is brutal with this combo. That broken heart image paired with cups hidden in branches says it all, really.