mada
When you date a girl, you two have nothing related, date < case < relationship.
To this work, you two have to show you cards, to a missinterpretation dont happen.
So, if you still dating someone, you can date other peoples, you date do the same.
If you are in a case, you two can separete and come back again, its nothing serius, but you cant date other girls without making clear.
Idk if is like that in you country, but here in Brazil is like that, like, now i am in a case, but i make it clear its nothing serius.