<human>: Give me a shortened version of the text

So the title basically says it. By the time her senior prom comes around, I will already be 21 and can't go. We both went to her junior year prom and it was a blast. 

So she brought up yesterday that she would most likely take her good friend since he never went last year. Now, I have no issues with her having friends that are guys. Or wanting to do something like this. 

However, this guy is HEAD OVER HEELS for my girl. He pretty much told her the other day about how he feels towards her, and keeps wanting to take her on a date. Now, my GF said to me that she would tell him that if he tried touching her, making a move, or kissing her, my GF would slap him and hit him etc...And I know she would. She's a tough cookie.

I just don't feel OK with her wanting to take him. It's not that I don't trust her (I do), it's just that I'm not comfortable with him being all crazy for her. 

Am I wrong for feeling like this? How should I talk to her about it? Has anybody else gone through the same?
<bot>: GF of 1.5 years wants to take her good friend to her senior prom since I will be 21 and can't go. The guy is head over heels for her.