This is a tough situation that is, unfortunately, experienced by a lot of spouses, partners and significant others of people who have bipolar disorder.
Everything you've described is consistent with hypomania or mania. The key question here is - what kind of treatment is she getting? You say she is diagnosed so she has, at least at some point, been under a doctor's care. Is she taking medications now?
No matter what, the best thing you can do is get her to see a psychiatrist. Even when someone is taking medication to help control bipolar disorder and has been doing well, breakthrough episodes can occur. Also, it's not uncommon for medications to lose part or all of their effectiveness as time passes. Physical changes can affect the way drugs work in the body. Changing another medication, or the dose of another medication, can affect the ability of other medications to do their jobs well. And for whatever reason, sometimes drugs simply don't work as well after being taken for awhile. (I had that happen when Prozac was the only drug I was taking. It worked great for a year, then gradually became less and less effective.)
I have to tell you the hard truth that sometimes there's no good solution when a spouse who has bipolar disorder starts acting on hypersexual impulses. Only time will tell whether your wife's actions will cease with proper treatment, and if she continues like this, you'll have to make some tough decisions. Right now, your best bet is to get her to see a psychiatrist as soon as possible.
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