Best male mate&my sister...

Katie • ❤Dec- 07/01/16❤Audiology Receptionist👂🏻🏥💻📑

My best mate (who is male and my age, 22) has asked my sister (whose 18) out on a date and i dont know how i feel about it.... to be honest at the moment id rather not bring it up with my mate or my sister and i would rather pretend this hasnt happened, does that make me a bad mate and a bad big sister?😐