Feel like long time no see even actually it is just 7 days pass. A week. Lot of things happen. I dont really know what happen to you. You said nothing to me.
Have you ever miss someone even when you are near them?
This kind of feeling sometimes come along with regret. The people you will be missed leave you or you leave them.
Before you get those kind of feeling, try to get lot of quality times with them. Learn a lot of stuff from them. Make many memories with them. So you wont regret when you have to leave them or they leave you.