How cheating starts

Cheating starts whenever a guy has a really good friend that's a girl. They become really good friend and then usually not all the time the guy starts to like the guy. Then he starts spending a lot of time with this so called "friend". So when a guy is spending to much time with his "friend". You should probably start questioning him. To make sure hes not up to know good and if you think your boyfriend isn't the honest type well then kinda see what happens. But to keep yourself from getting hurt you need to lose feelings for him.