Deception may be used in a psychology experiment .

The use of deception can be tied to the earliest experiments in social psychology, but it began in earnest after World War II when social psychology began to prosper. In the 1960s and 1970s, many of the most famous and most important social psychology studies involved deception.

Explanation:

if your boyfriend is cheating on you, my best advice to you is to dump him, he's only going to drag you down. and if you do, don't fret there's plenty better that know how to treat a person right. i mean honestly, the whole point of a romantic relationship is love, and if you love someone you aren't going to cheat on them. i do believe in second chances, but why would he cheat in the first place? i personally feel that if someone cheats, they ruin any chance they wanted/had with you. i wish you the best of luck with this, hang in there.