I don't like being moody

I went to my sister's place last week. We haven't met 2 weeks because I was to busy with the Campus life. Then, on saturday she fetched me up in my place with someone that always by her side. I'm kinda miss the old times. Our old times. Only two of us. The privacy and the stories just for two of us. No one else either me or her would turned up and share. But these time no more, I feel like I am no more at that place. I've been very far away. I don't feel good at all being at that situation. I don't want her to make a choice. I know at some point I always have the 1st priority, but I've grown up and I would always and glady give my place to her. I even didn't speak to her how much I dislike someone who stole the 'love' and the time. I even didn't have much space to say it or to show it how much I am so frustrated, sad, mad and hate. And if only I have a chance or the strength to tell that I don't trust that this someone will be taking her good, because I felt that she's the one who take a good care of this someone. I witnessed using these two vision and my truly heart. I cannot imagine my life and my parents life is she choose the life with this someone. I've been rude, I've been changing my mood evert ten seconds and I've been crying deep inside my heart and I am sorry. But, it's best for me to just be silent and keep my distance, if that would make u happy with this someone. I am not happy but I choose to take care of ur heart first and forget mine. God will be seeing us, I know.