Let's say you want a girl, and this other guy who you don't like wants to chill with her also. To avoid her chilling with him, is it good to say something like: That guy is pretty weird OR to just ignore it and be neutral?

Dude, it doesnt matter aslong he is not her boyfreind. If he is in the freind zone He of of little to no threat to you, (that being said, i do know a natural, who is defently a threat to the average guy, but just becuase their bf dont want them hanging around with him they still do anyway... in semi-secret and that is defently not what you want to happen) if he has not made his move in the last x number of years what the chance he will make a move now.... She WILL 99% of the time choose her freind over a guy she has just met, so you would be pretty stupid if you tried to out amog him, especially if he is no threat to you.

Let's say I've known this girl for a while now, and I know this guy likes her. What would I say to her?

Lets forget this other guy, as i said probably no threat put him out of your mind. As you will be in the freind zone you have to make her want you, look at other girls when she is out with you, treat her like one of the boys, make comments about other girls, Gambler did a whole dvd on this i recommend you watch it

This girl I'm talking about is coming back from a 3 month vacation, and haven't seen her since then, should I do the friendzone method, or just the usual stuff? Like do you think I'm still in the friendzone?

I was going to do something similar to this and what I was planning on doing was ignoring the other guys in her life, isolating and escalating. Hell, you can fuck her for free this way: no paying for dates.