There's this guy who lives right across the street from our house (a bachelor in his 30s) and he's been talking to my 13 year old daughter a lot, she's been acting friendly to him too and going outside a lot to try to talk to him. I didn't think too much of it when they were just making casual conversation but then my daughter said he actually asked her to go out somewhere with him and I told her she couldn't go, and then he even came to our door and brought a present he bought for her and asked if he could talk to her and I said no. Then the next day on her way home from school she went into his house to visit him without telling me anything about it until I found out for myself. My daughter and I have always been very close and she's my only child. I'm worried about her safety and concerned about this guy's intentions, what should I do and how should I keep her away from him?