Does this make me a bad person?

I wouldn’t exactly clarify this as a suicidal post, but I need to get it out and hopefully receive advice. My best friend and my older brother just recently began to have a ‘thing’ and it tears me apart. They understand I have been very depressed recently, and both now I cut. But they both think I’ve stopped. I thought I was going to as well, but, last night when she completely abounded me for him as soon as he got home. My parents weren’t aware of this. I didn’t want to sit and watch them be all over each other so I just left, and sat in my kitchen for three hours alone. I went into my parents liquor cabinet to numb the pain, to feel numb again and hell it worked so well. I would’ve gone and gotten my razor but the day prior I promised my best friend I would stop. She and I flushed it down the toilet. Then last night came and I went for the alcohol, it didn’t help. SO I got my fathers box cutter. Then after 3 hours alone, they came down, oh so worried about me. Idiots left me alone and suddenly felt bad for me. BS. They insisted me to go watch a movie with them. Although I was content on my laptop writing last nights post. It took me maybe ten minutes to be tired of being around them so I left and ‘went to bed’. I woke up not only alone and confused. I woke to find her sleeping with my brother(not sex), in my guest room, where they had been watching movies. I told her from the start to not a) choose him over me and b) to not be all over each other with me around, both happened last night. I recently thought I lost her, but last night i did.  BY MY OWN BROTHER. My parents obviously saw, she came back to my room and I pretended to be asleep. Finally she left without us really talking. She kept texting me and w’t wondering why I was ignoring her. And then some girl called her and called her a *****. And I still didn’t reply. Does this make me a bad person?