It might be that the girl who was constantly calling you was a feeder. I set their call chance to be very high, as my design approach was to make them simulate the player (who I assumed would call their target girl most times they're free).
What I might do is add a slider to settings that lets you control how often girls call/request a date. I can also look at adding a button to check them out in that situation, too. Thanks for flagging that!