Rant #17220

I have these feelings that I'm not supposed too, I have a crush on my best friend, I've liked her for a year now, I've hid it and never told anyone. I want to be her one. I love her so much, it hurts. I've given her so much advice on her previous relationships (3) and I still haven't even hinted that I like her. She's in a relationship right now, but they have been arguing a lot, I don't want to be the person to ruin it and be the homewrecker, I don't know what to do