Any help?? Please i need it?

so i have a best friend. her andi have been friends since 4th grade and stuff. we stopped but then started being friends again in 7th now we are in 9th and still pretty good friends. lately shes just been blah like she hates it when i hang out with my friend. and when i talk about hanging out with other people she gets all jealous and bitchy acting. so right now i am thinking of taking a break from her. shes always been there for me so i feel bad just leaving her behind but i think i really do need a break. today i was kinda rude and didnt talk to her now shes acting all moody and stuff i just dont know how to do it. should i slowly stop talking to her or just tell her sorry for being pissy but i think we need a break from eachother because we always argue. im really sad with doing it but i think i need it right now. HELP ME!!! advice?? please?? should i be nice to her and just not hang out with her after school? like just be in school friends? she thinks i want to take her to new york with me but i dont!! and she wants me to go to maine with her this summer but if we are going to argue then no!! help me i neeeed it.