Going to People’s House

I just found out that my best friend went to my other friend’s house. I wasn’t invited, and I’m not trying to sound bad, but I haven’t been to her house in over year, and our other friend has a bunch of times. The worst part is, she lied to me, and told me she went out to dinner for a family birthday. But I have the Facebook pictures to prove it. Why do I feel that she hates me?