Best friend ignoring me- should I just forget about her?

My best friend of many years just started ignoring me out of the blue. What would you do if this happened to you? It really hurts because I feel I haven't gotten an explanation and she was like my sister we were that close at one point. I reach out infrequently just to say hi because I know she's busy with stuff, but she now only sometimes texts me back. She never reaches out to me either.

Should I just forget the friendship and move on without explanation? Have you been through this? We were very close so it just hurts.

Best friend ignoring me- should I just forget about her?
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