My "bestfriend" help please..?

So, I have one bestfriend I thought I could count on for everything I've known her for a long long long time but we just became like super close a year ago. Well we always have little fights and most the time its her like shes ditched me or lied to me, or ignores me. But I always move past them well this summer she was suppose to go to the lake with me for a family thing for a week well we planned this like 4 months ago and all the sudden she can't go because "her grandma planned this other thing at a different lake for their family." Well I figure out she really lied and is actually going to branson with her friend Mckenna well I think thats kinda messed up because I just moved 3 hours away and haven't seen her in like 3 weeks and shes been with mckenna everyday and always says how she misses me so much yet she ditches me to go to branson with Mckenna instead. Am I wrong, advice please. I feel really hurt.