What are your thoughts on this ?

Yall probably heard the situation with my cousin and you probably sigh like not again! Promise this is the last question as time is helping and im working on me but its good to have opinions from people out the picture! I will describe both of us and let me know your thoughts. It kinda like the ying yang. She is beautiful, sharing, if I do a comparison with last year, when I invited her to get together or we were with friends, before I never understood why but when everyone would say hi to each other, she would stay there quietly and not say hi to anyone. After a her of making remarks and asking why she wouldn’t say hi because everyone including myself found that very weird as well as disrespectful (I a way because when there’s parents you should say hi and she just didn’t) and its only now that she started saying hi and all. She said it was because she didn’t want to seem like she was forcing anything (so that people would not respond her so in order to avoid them not answering when she says hello, she just didn’t.) Also at first we all analyze her as shy but then I notice that when it came to asking a cigarette she was able to ask people : “Excuse me do you have an extra cigs” Then when I made her my observation she said, I guess you’re right maybe I’m not really interested and I also want to avoid ‘asshole’ people. A lot of people think she doesn’t really think and is very slow but sometimes I think yes maybe and sometimes I think does she really not understand ? Anyway one thing that she did that made me ask if she was self centered was I was wearing a lip stick one day and decided to take it off and she almost didn’t wait until it was off to take it from my hands and put it on… And 5 years ago my little sister was in love with this guy and he was at our house and my cousin came and I guess there was a spark and they started taking and went out together for 4 years but he was and still is a complete asshole so her was not faithful and ‘drop her near the end (almost a year ago) and she really wanted to keep the relationship going but she was seeing how much not honest unfaithful and the asshole he was and didn’t really make an effort so she finally stopped. But even now that he still have a little spot in her heart, she want to apologize to my sister because she says I was selfish I didn’t realize back then but I don’t want things weird with her no more. But since the incident with the hair happens I almost feel like telling her never mind in apologizing to my sister because it almost seen like she does want she wants and its only if she sees a reaction that she want to say are we good or I fuck up _ , like she went out with the guy 4 years and there are not together today because HE does not want to.
And on my side I I’m funny, intelligent, and is very considerate. The thing where you says she wants attention I’m not sure because when we are out in public or social places she gets very anxious. She gets anxious because everyone’s looks at her and say shes very beautiful than other turn to see and confirms and when i asked her why she gets anxious she said it’s because everyone looks at me, and recently she said it almost like they want a piece of me.
Me on the other hand, I get super anxious because I hate when people look at me, and the they start comparing.. :( and then I remember the situation with the guy who broke my heart.
She had asked me tricks on how to handle her anxiety and I have told her to look at it this way, shes anxious because people thinks she beautiful and that’s a compliments, I told her I get anxious because they diss me for your beauty and I don’t like myself. She said it true its a compliment. But i recently stopped talking about the way I feel about myself because she the type to listen and just say aww and not really give advice :/ maybe it’s because this kinda struggle(being ugly) doesn’t touch her.
Anyways sorry for the novel hope you get it and thank you for your time everyone!!