re: Dad's letting daughters date.

You did the right thing.

I know I will get downvoted for agreeing and that's OK.

Don't let her rush growing up. Thirteen is far too young to deal with the complexities of having a "relationship". She had her whole life ahead of her. Plenty of time for all of that when she is older. I think the most important thing that she saw is that you care about her enough to protect her from an unwise situation. She may hate you now, but she will appreciate it down the road. Good job, don't be afraid to be the a-hole parent. I wasn't.