Should i care??

Hi, so im 12 and i have known this guy since the fourth grade and he is homestly the love of my life. But i just found out that he is gonna ask out one of my bestfriends and they keep asking me if its okay for them to date beacuse they known how i feel about him. I keep telling them im fine but im really not. I dont know if its okay for me to feel like she took him from me or if its just me. But i cant stand looking at them together, i just really need some help woth this . PLEASE HELP I JUST NEED POSITIVE FEEDBACK AND A ADULTS POINT OF VIEW 💔💔💔😭