Yes
Chat with our AI personalities
if you give it some time and a lot of work, then you can get your sims' relationships back up. the sim that caught the other sim cheating will be furious for a while, but give them a couple days and they can end up back in love again.
have your one of sims cheat on the other in front of their "current" partner. flirts count as cheating.
no. if you do try though you will get caught and punished in the game
Yes you can but only when you turn off the game
um..... They have to be married, like each other a lot (daily and lifetime relationship to 100), they need to be in bed or in the spa etc, if one has caught the other cheating I suspect it won't work, should be opposite sex. I think that is what you need to have that option.