Next time, don't do this. Even when you don't have many girls you have to set things up so that when you do, she wouldn't notice. When you change your behavior girls start to notice.
So, next time you see her give her kiss, and a very good hug and while you're holding her tell her how much you like her and how much you like seeing her, and how you love her surprises, but that from now on, to call you first.
This will work a lot better now, because when she asks you if it's because there are other girls you can congruently say "no". It becomes more difficult if their are other girls.
Of course if you're happy with one Wakayama girl, than that's fine too.
You think she lied and said she's OLDER than she really is?
You did awesome...keep at it.