Hi mmb86
First...someone's being bipolar 2 isn't always a cause of personality change and police involvement. IMO, there's something else going on for him--has he mentioned a comorbid condition?
Second, take a look at the DSM IVr (it's online) for a good picture of what a diagnosis of borderline personality disorder looks like--and take a look at the stickies at the top of this subforum. It is emotional instability in you that should probably be of concern to you, whether as a marker of the condition or of a problem that interferes with the life you want to live. Clinginess can be the result of many disorders, some of which are neuroses, not illness. You might try going to a psychologist for an evaluation, rather than to a psychiatrist: the psychiatrist often reduce their jogs to writing prescriptions--depending upon how they want to use their time.
3. If you're not living the life you want to live, get professional help if your own efforts are not being successful.
Best of luck!