<human>: Can you provide a brief rundown of the text in within 3 sentences?

I know I'll look like an idiot with this post but I'm really a normal guy who did a stupid mistake.
 
I met this girl in the net a year ago. After a while we became friend but we haven't met each other in person because she lives in another country. Gradually things between us became more sexual and she began sending me nudes. She asked me to return her favor. I was doubtful at first (I'd never done this before) but she could convince me eventually. I confided her some photos as well as videos. She always requests more but I'm not comfortable with posing in front of the cam all the time. I'm sure this kind of friendship can't last long (she thinks contrary). I'm afraid she publishes my naughty contents if things don't go as she wants. Needless to say this would be a real disaster to me. I'm still in contact with her (less than before) but I don't send her any pic or vid. Also I have already said her many times that my life will reach to a dead end if she shows my contents to another person.

I need help to get out of this nightmare!
<bot>: I have confided some of my sex pics/vids to an internet friend and I'm afraid she decides to share it over the net. I don't know how to end this relation.