Is it normal to feel like this?

Tyna
My boyfriend is a very likable guy. He's very nice and sweet and all around great person. There are three girls who have come forward to me and said they like him and two of which I'm not concerned about. One though, well she kinda makes me feel a little scared. Me and her are good friends and she 's told me that she's seeing someone new that she's liked for a while and is over my boyfriend but I'm still scared about her considering all that's happened. I'm not gonna go into details but should I talk to my friend or my boyfriend about this? My boyfriend hasn't said anything about the whole situation with my friend but I'm not sure if I'm crossing a line by asking him.