If you are talking with someone while you are in a bad period, how do you prevent yourself from screwing up?

If you are talking with someone while you are in a bad period, how do you prevent yourself from screwing up?
I've got back in touch with a friend who's more or less helping me in sorting out my issues and that's going through a bad moment herself.
I try to accept her advice and give her some advice at the same time, but I fear I'll have one of my outburts/ghost her without warning and push her away.
What are some methods to prevent that?
Updates:
16 d
Never mind, I blocked her
If you are talking with someone while you are in a bad period, how do you prevent yourself from screwing up?
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