My best friend says she gets anxiety when I don't respond to her messages fast enough?

Anonymous
We have been very good friends since 4-5 years now. We speak on a daily basis and we share everything. Both of us early 20s. Currently living far away from each other since we are studying at Unis, but we meet in person when we go back to our hometowns.

She is on the phone a lot more than me however so she responds faster most of the time. I always respond too, maybe a bit late occasionally, but it rarely happens.

And whenever I do respond a tad late it bothers her a lot. She sometimes deletes voice messages that she has sent and I haven't read yet, and yesterday she said she gets insecure when I give her a late response? And by late I mean even 3 hours is late for her. She has mentioned in the past aswell a few times.

What should I do? I don't know why it bothers her as much but honestly it gives unnecessary pressure to me. It's been happening for a while now.
My best friend says she gets anxiety when I don't respond to her messages fast enough?
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