"You can never enter a girl's mind, but telling a girl you like her before anything has even started is the DUMBEST thing you can ever do..."
Are you sure, Kauru? I don't think your statement matches his question. In spite of that, I don't think telling a girl you like her is bad. I, for one, don't like guys playing games and pretending. I like them to be up-front about their feelings toward me, as I could usually tell early on, anyway. If they pretend and then come later after I show no sign of opening up, I'll tell them off and never, ever consider them 'cuz it's just so childish to me that any guy would act like high school kids.
[Skywalker:] "Now.. why the HELL is it all of a sudden cool and perhaps maybe even funny if a girl hears that you've liked her for a long time if she figures that out AFTER the relationship begins, vs. if she hears that BEFORE the relationship begins?"
Do you want to know the rethorical question I always asked a guy who professed his love for me for 2 years, even though it wasn't reciprocated? Well, I was puzzled and always asked: "How could you claim your undying love for me when you don't even know me!"
I thought that was extremely odd that someone who didn't know me would say how he loved me and wanted to spend his life with me. It freaked me out, but I was pretty strong, or so I thought, to just shun him. A naive person may just think, "Oh, this person must really love me if he's had this feeling for that long." However, even a naive person may not think that way; instead, she might freak out. I kind of began rationalising the former way, though . . . as the person persisted.
Think for a moment, Skywalker: If a stranger came to you and professed an undying love for you (i.e., one that's persisted for long), would you really think, "Oh, love is irrational, abstract, just an uncontrollable emotion, so it's okay!" or would you wonder how someone who didn't know you or get to know you would say that? I mean, even if it were a pretty lady, you would be happy but see it rather odd that she would say that without knowing you, wouldn't you? You said you were in her circle of friends, but it sounds deeper if you seem to be spying her in other ways. If you were that close to her or knew her much, you wouldn't have to do things like that.
You can keep on asking, but you'll only see what you want to see, and hear what you want to hear. Pause for a moment and reason yourself.