DEEPER UNDERSTANDING - are you someone's proud possession People always call you THEIRS!

When someone calls you "theirs" it's like they're unconsciously thinking you are there to support them and slowly build expectations into this. Reason why some people get really disappointed if you can't, for whatever reasons, help them (maybe you're busy, or have own things to attend to, yet to them it's like one deliberately doesn't want to help them - also there is a suspicion, since simple-minded people are always suspicious).