CAESAR'S CIRCUIT : THEY SHOULD BE BOTHERED YOU CHEATED

If you doesn't feel bothered after they cheated on you, it's very bothering. It's bothering because you may not really be in love. 

People who are okay with you being with someone else even when they are in your life, are very not good for you. Continue being with them, you may never know what it feels like to be a better person.