I'm going to see a guy my friend likes
I am surprised to hear that. Why would you betray your friend?
I will if I think he's not worth it
I can see that you may just be looking out for your friend, but your friend may still feel betrayed by meeting up with him by yourself. It can be seen as you wanting to get with him instead of your friend, which is scummy.
Eh, I won't tell my friend how I feel about him anyway or what I think about him. It's her loss for not doing anything about it.
Usually it is expected that your friends do not go after the people that you like. You are going to appear very disloyal if you proceed with this.