Am I clingy or just insecure?

I have a girl (though we chose to be best friends for now since she wanted to heal herself ehile I wait for her) abd everytime she leaves me on sent or delivered, it makes me anxious. I keep saying "it's fine" or "it's okay" whenever she apologizes for 'ghosting' me like that, it hurts me whenever she leaves me on sent or delivered. And now it had increased because she and her brother aren't talking with each other and her brother won't let her use her phone. And now that opening of classes will be on 8th of June or on 15th of June, I'm scared that she'll completely ghost me or she'll fall out of love with me. And now she's not replying ever since Friday (today is 22:27 on Saturday), what do I do? Do I wait for her to reply and distract myself with other stuff? She's the only person I really talk to on messenger unless the opening of my classes which is on 15th of July.