Of course, a girl will have a tendency to fall in love with her guy friends. That's part of the edenic curse, back in the Garden of Eden:

Genesis 3:16
To the woman he said,
       "I will greatly increase your pains in childbearing;
       with pain you will give birth to children.
       Your desire will be for your husband,
       and he will rule over you." 

It may sound like a good thing to have a desire for your husband, but it's called a curse for a reason! That's why it's so hard for a girl to be single, always wanting that close relationship with a guy. She is always desiring for her husband, whether she knows him or not.

You have to guard your heart as a girl. I can't emphasize how important that is. Realize that these feelings you are developing are part of that curse, and that God will bring your husband to you when the time is right. Once you realize where these feelings are coming from, you can get over them and enjoy friendships! God made Eve for Adam's companionship."

- http://www.xanga.com/droftreeology