My best friend is being mean towards me?

well i started to notice this about 2 weeks ago, it was the midterm and i started hanging out with my best friend '' grace ' for the first week of the midterm i was hanging out and we had a sleepover everyday of that week' and a few times during that week my other best friend '' paige ' asked me to stay in her house but i was staying in grace's and she asked me to stay another night but that night grace was staying over in my house, the next week paige seemed really annoyed to i asked her to stay in my house one of the days' so she stayed and everything was fine and then she said to me the day before we wnt back to school over facebook that im stuck up and that she feels i have changed a lot and i have high expectations and stuff and i apologized to her and everything was okay and then i was meant to go the gaeltacht with her in the summer but then i said i didnt wanna go, and she was begging me to go and asking me why and stuff but i dont have a pacific reason of why i dont wanna go' she wouldnt talk to me the next day in school and then i told my other friend ''sarah'' why paige wouldnt talk to me and sarah talked to paige and then everything was okay, but she was being vague towards me so i just stop talking to her and i said it to her and she said i never make an effort with her and i said that she doesnt make any effort with me so we both agreed to make an effort with each other' today i went to the gym with grace and then a few mins ago i was talking to paige and she asked me what i did today and i said i went to the gym and she said i bet i no who GRACE!! and i asked whats the suppose to mean and she said your always with her and i feel you like her more than me and your more closer with her than me and you do everything together... i dont know what im doing wrong and i dont wanna have a fight with her over something stupid please help me, we are all 14..