How do you deal with a jealous friend?

It's gotten to the point where she ignores me unless she wants to brag about her life somehow. And any time I tell her stuff about my life, I get left on read. I don't know how to deal with her anymore and I really just want to end this 18 year friendship. Because any time I think we're okay, or I do her favors, etc, the cycle continues. It's exhausting and I don't want it anymore.

How do you deal with a jealous friend?
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