Its very hard to accept someone who you feel like a friend. But its not bad If she like you very much. Think for her and ask a question for yourself. That is she bad for you or not ? Because My friend marry with her cousin. They both are like good friends and never think anything like to become husband , wife in future. But they accept each other and having a good marriage life.
eks... that's cool dude. it's okay that you're not into her but be clear about it. no mixed messages.
