If you found out that your girlfriend/boyfriend didnt need you, would it bother you alot? Like, they wanted to be with you because they liked you, but they werent emotionally dependent on you... Would you feel unneeded?
Now, there's also emotional interdependence, but that's usually only something that develops over time, and rarely present at the start of a relationship unless you were either close friends already, or there was some special circumstance.