My friend has liked this guy for over a year now, but nothing has ever happened between them. They've only had the average friendship- she always initiated the conversation (usually lasting 5 minutes), he was always polite but never overly so, and she never felt a "spark". Me and him have inside jokes, he supported me when I freaked out (nothing big, but still sweet), and we can sit and talk about nothing and not get bored. We don't always understand each other, but we get along. Now, my friend says she's okay with me flirting and such with him because she's trying to get over him- but I'm not entirely sure about it. Am I crossing a line here, or is it okay?