Go for it - you're not the one being cheated on after all!
Voters:
Depends on the guy/girl wouldn't completely rule it out
Voters:
Politely decline - You're not the first and won't be the last
Voters:
Cut this one loose, you're too good to be a bit on the side
Voters:
Call them a rat and leave abruptly
Voters:
Get straight on the phone to their other half and expose them
Voters: