LNS - how do you know when your being cheated on && caught in between thee two!

have you ever felt that your girl was cheating on you? what are the signs? have you ever caught your girl cheating? and what would you do if you caught you girl kissing your mom? ALSO . . have you ever been torn between two girls? did they know about eachother? if your in love with two people would you tell the other one? and if so..how would you let them know?