Ok so there is this guy who I've been crushing on for a while and he is really funny and smart, and I just can't talk around him. Another bad thing is, is that he is my bff's ex an dhe aske dher out a few weeks ago and she said no, do you think she would be mad? I need help!

Was your best friend actually dating him or did he just ask her out?
If she said no to him and they never dated it should not be a problem.

I really can't stand that whole ex's are off limits rule.

Why does your friend get eternal rights to this person that they couldn't make a relationship work with.

If you like him I would go for it.