Why don't care for my sister moving out.

My sister thats 2 years older than me moved out and i don't really care and aren't bothered. She moved this August. I don't really think its a big deal. I took my time to be sad that she moved out and now she says that I don't miss her. I honestly don't , Im grown and I have my one life I can't me in her life 24/7 listening to her rant about her new school. I am just not feeling the obligation to listen to her after she started drama with my family when I didn't visit her when I was in the same city. The reason was because I don't really like it at my dads as that where she lives. they are five people now and I have no room for me. I legit arent alone and I love my alone time . She acts like its been a year when she didnt even say happy birthday to me and claims she does when my phone was only dead 20:00-00:00 the next day so if she tried to call me. And claims she called me multiple times but I haven't gotten anything. She had my location on phone and snap so she could of checked if I was asleep. As the main reason I don't honestly care if she comes home is because she didn't even say happy birthday to me. She claims she didn but my phones was as stated early dead only during the last hours of my birthday and she didn't even care to write to me. I don't honestly care for it. As Im not going to ruin my mood on my birthday or my week for her and making me feel bad and gulittrip me. Sorry that you missed me but I didn't miss you.