Need a relationship help ASAP!!! please help. should i stay with this girl??

I AM A PRETTY POPULAR GUY, I CAN HAVE ANY GIRL I WANT BUT THE ONE I WANT I AM HAVING PROBLEMS WITH. I LOVE THIS GIRL TIL DEATH, BUT SHE THINKS I MIGHT DO SOMETHING TO BREAK HER HEART MOST LIKELY(CHEAT) WHICH I WILL NEVER DO. AND SHE HAS A LITTLE JEALOUSY THING THAT SHE DOESNT LIKE WHEN I TALK 2 FRIEND GIRLS AT ALL EVEN IN FORNT OF HER, BUT I LOVE HER WIT ALL MY HEART. AND I DID SOO MUCH STUFF FO HER FROM FIGHTS TO MEETING THE FATHER AND SACRIFICING SOO MUCH FOR HER. SHE SAYS SHE IS AFRAID OF GETING HURT AND SHE DOESNT KNOW IF SHE WANTS A BOYFRIEND RIT NOW, BUT ALL HER BESTFRIENDS HAVE TOLD ME SHE LOVES ME TO, SOO I NEED TO KNOW SHOULD I STICK WITH THIS GIRL OR JUST LEAV HER AND LET HER REALIZE WHAT SHE LOST??? PLEAS HELP