<human>: Can you summarize the given text in a few sentences?

Over the past 5 years I have noticed that my older sister has started changing- for the worse (in my opinion). 

Every family function is about her. If the conversation does not involve her or her accomplishments she seems to tune us out and plays with her phone. 

She never asks questions or seems interested in the things me and my younger sister do. Recently, the addition of her new boyfriend has been making it harder on our relationship as she seems to put him far before her family. An example would be that I came home to visit, the first time in 4 months, but instead of being able to hang out with me she had to go to her boyfriends cousins birthday party.. 

Perhaps she doesn't make time for my sister and I because this is her first boyfriend, but I am sure she would act the same if she wasn't dating him. 

Also she does things to attract attention to herself. During our trip over the holidays, she left family brunch to call her boyfriend and came back in the room to finish her conversation so people would be forced to ask about him, even though he had already been brought up in conversations before then. This seemed very rude and I felt slightly embarrassed for her as this seemed like such a desperate act for attention. 

Also, she treats me and my sister like her daughters. This becomes very embarrassing for us when we're at family functions because it's degrading and disrespectful, I am 23 not a child.  

I am not one to cut ties with someone so I find myself struggling to keep our relationship going. I'll text her every once in a while, but she only answers when it's regarding something of interest to her. When I come home, I ask questions about her life because I am genuinely interested but also polite. Maybe my life is boring compared to hers but it would be nice to feel like she cared. 

I want to explain this to her but am not sure how. I don't want us to become estranged or resent each other. How can I approach her about this issue?

Sorry if I rambled or didn't include enough specific examples, I can answer questions if you have any!
<bot>: Older sister only cares about herself and it's hurtful to me. Don't want to end our relationship. How should I confront her?