My girl is quitting because i dont call her,at least three times a day.--what should i do??

I am a serving Corps members in Ondo state, and my girlfriend is a fashion designer and a student, in terms of financial needs she is self sufficient, but i don’t really understand her. I love her that is the fact, i intend settling down with her very soon, most of the issues I have with her is that ; she wants me to call her at least three times a day , and most of the time we do chat on whatsapp, and I feel there is nothing really to say that will warrant me calling her. Mind you I call her at least four times in a week, I am not a good caller anyway, but that doesn’t reduce my love for her, I don’t really know what she wants. I called her this morning and she was complaining I didn’t call her, that the sister who came to visit her, the husband calls her almost every hour, and I replied by saying I am not her sisters husband, she should learn to accept me the way I am, and if she can’t she can let go, she sent me a text that it’s over, I am not perturbed anyway, but my worries is, why should this be an issue. Please drop your comments below. To share you stories, relationship issues, or need advice kindly send a mail to prbxselfnetwork@gmail.com.  ***prbxselfnetwork***