Me and my best friend are drifting apart :(?

Well me and my best friend have been friends since like 4th grade and we have always had like the same group of friends and all that. But this year (eighth grade) we had a group of friends (4 of us, girls) and we all hung out like everyday. But she a few weeks ago she wasn't able to hang out for like a week because she was in ny with her uncle and me and my other friend got like way closer. And apparently me and that girl were clinging to eachother even when my best friend got back so she started to cling to the other girl from our group. And last week my best friend and her friend took her little cousin to the park and stuff and didn't invite me and my friend so we hung out together with another girl who isn't in our group who smokes and stuff and two other guys who also smoke. And we saw my best friend and her friend at 7-11. When we left my best friend texted me and was like "all of the bad thing do-ers are taking my place :(" and i told ehr they weren't but she didn't invite me to hang out with them. The next day i hung out with them again but that was the last time we hung out with them. But now me and my best friend are like really distant and everytime i ask her to do something shes with her other friend. I've been trying to put her first and i've been asking her to hang out like everyday but she never says yes anymore. She's just always with that girl because shes like, scared of me now because i hang out with those people sometimes. Am i wrong in this situation? should i like drop them for her? i mean i really ask her to hang out before i would ever ask them but she still thinks i ditch her for them :/.