Im a guy and my best friend is a girl (we are both in our 20s). She been seeing this guy lately, after a whole year without dating and for some reason I feel jealous/threatened by the new guy. They've just started dating and they are already considering having sex and all and it just bothers me for some reason. I m not really sure what to do or think about it. Should I talk to her about it? Or what? She is a really close friend of mine. Have I gotten attached to her? What should I do? Should I talk to her about how I may be starting to fall for her?