In brief, I met her by chance on a public event and talked with her for a while, about twenty minutes, this was the first and only time I even talked or seen her.

I admire the girl and I got her Facebook profile, (she is not my friend), and don't want to add her not to appear as a creepy guy.

I want to send her a message telling her about my feelings and that I want to get to know her more because I am looking for my life partner.

Any advice?