Or have you been posessed by the green eyed monster?
I wouldn't go so far as to say I was posessed, but he's paid me a visit from time to time.

Are you a jealous person?
I don't think so. I prefer that my S/O have plenty of friends, male and female.

Is jealousy a sign of insecurity or posessiveness?
Sure.

Is all jealousy unhealthy?
No, I don't think a bit of jealousy is unhealthy. I do think that there is a fine line though.

Do you like it even a little bit if someone is posessive or jealous about you?
To a small degree. Let's me know that they care. I would feel uncomfortable if my S/O didn't care in the slightest.