When he goes meet She for dinner.. you should go along too.
You are the GF, I'm sure She wouldn't mind.
Be extremely nice to She, and let her know how grateful you are
to She for being there.
No need to make enemies because of your own jealousy.
She will know when to let go eventually.
I think i dont wanna come btw them, we quarrel over her few
times. but i decided to close one eye and let it be. though im
feeling uncomfortable abt it
* when I'm attach to him ** the first few things he want me
to know is about his best friend SHE this show that
is improtant to him that his gf accept his bestie
* I learn that his ex- have prob accepting his besties too.