Possessiveness ... Good/bad/ugly ?

How possessive can one get ???
Started writing on this and i got stuck...

have not been a person, who is too possesive..

But at times, i have noticed that part in me, which turns and twists from being possessive to protective and then defensive/offensive..

Is being possessive good ??

Is it an invasion into the other persons privacy?

Is protectiveness good/bad?

Should we be possessive at all ?

Will await some thoughts ...