How to deal with someone with BIPOLAR DISORDER?

How to deal with someone with BIPOLAR DISORDER?

A good friend of mine has asked me for advice on how to deal with his wife, who started to have wild mood swings a few months ago. One moment she'll be yelling and screaming at him, blaming him for everything... "I hate you!"; a few moments later she'll be calm and loving. They are both in their 60s and he believes that she may be suffering from BIPOLAR DISORDER.

https://www.mayoclinic.org/diseases-conditions/bipolar-disorder/symptoms-causes/syc-20355955

I've never dealt with someone who is bipolar and don't know what to say. I've suggested medical or psychiatric help, but she won't agree to any of that.

Has anyone dealt with someone who is bipolar? If so, how do you handle it?

How to deal with someone with BIPOLAR DISORDER?
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