there's a thin line between being possesive and insecurity, but what polar opposites they are.

possessive is when you're being selfish, and you hate it when she spends time with other people because you want her life to revolve around you.

insecurity is when you're being selfish, and you hate it when she spends time with other people, because you're afraid someone may take her away from you.

and they say the latter stems from self esteem. or rather lack thereof. because u just arent confident enough. but that's only half the picture.
nothing is absolute on its own.

people, show those loved ones of yours how great they are, how loved they are, and how no one will ever be a threat, and how you wont even look at anyone else because your eyes are of him/her alone.

and make sure you dont do it just when you feel the moment is right.

sometimes, the situation calls for it. and you REALLLY need to learn how to take initiative.