This is a stupid reason to be upset...</3

So, my mom's best friend, Sheena, came over today. She's 24. And I like her. A whole lot. But she has a boyfriend, and a girlfriend, (and if you're wondering, no, they don't mind at all, they get along great), and I'm 15. Friday, she promised she'd cuddle with me all night. And now she's here. Asleep. On the love seat. Cuddled up to her boyfriend. And, the first night we started to get close, we promised each other we wouldn't cut anymore. And then she ended up showing me cuts on her leg. So, I have to sleep alone. Like always. I sleep so much better when someone's next to me...</3 I was so excited... And now I'm in my room, feeling like slashing my wrists into oblivion, just so I can see the blood and feel better, even just for a few minutes. I just wanna disappear. I feel like I'm about to cry my eyes out. I know this is really really stupid. But I really can't help it.