i personally feel that having a bf/gf complicates your life, you lie to your parents, ans especially those who date at the age of like 13 to 17/18, they aren't mature enough it, they will be having the feeling that "yes!this guy loves me alot and will be my life partner" then a few days later they start getting bored of each other and break-up.
this way your not just cheating others but yourself as well.