How do you deal with a jealous and obsessive partner?

How do you deal with a jealous and obsessive partner?
One of my girlfriend's few flaws is that she can get a bit possessive and jealous at times.
When she gets like that, I calmly but firmly rebuke her arguments and bizarre theories and do everything I can to reassure her and make her relax.
What about you?
Updates:
28 d
Obviously she recognizes this behavior on her part is unhealthy and she's working on it.
How do you deal with a jealous and obsessive partner?
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