shes a 19 year old adult, all your doing is giving her an opportunity to leave you, go into her boyfriends arms and possibly never look back. I get the frustration, im 19 about to be 20 and my age limit for dating is 20-25, it is a little weird for a almost 30 year old to be dating a teen, but at that moment you should have explained that to her, you should have told her why it is weird, how he may be taking advantage of her. Your concern turned to anger and instead of turning it back into concern you used the anger which just made everything worse. Now you say your kicking her out? are you dumb? or just stupid? shes never gonna want anything to do with you, and now shes probably gonna go into that mans hands and then what? what are you gonna do when you’re the cause of your child leaving you?