I m not possessive baby, its just Obsession
If you end up talking to each other on phone at night, after spending almost 23 hours together then it is really the obsession that has taken place of love in your relationship.
Even after years together, you feel immense tension over, what they must be doing, or whether they have eaten or not etc.
Hello... the bell is ringing!! Just answer it, and stop obsessing about them, as they might never have confided to you but it might be driving them off crazy.
Take a counselor's help or from your friends and start respecting your and their space in your relationship.