I've been watching my friend for years and I want to take her from her relationship. Then her and I can make a life together
I can't believe you would thin of doing that. Why do you want to ruin your friend's relationship?
I want her for myself.
You cannot force your friend to be yours. It's not right that you want to break up her relationship just coz you want her. You have no right to destroy her relationship.
She's my friend. Don't talk to me about what I have the right to do.
Do you really think she'd be happy to start a relationship with you after you ruin her current one. You'll end up losing her as a friend. It's time to move and and start looking for someone else to be with.