I'll see what I can do to explain.
I'm not sure if I said this, but I have absolutely -no- problem being single. So when I began to like this girl, I contemplated whether the benefits of pursuing it outweighed the costs and risks. Now, I'm extremely busy with school, so I eventually decided it wasn't worth it to try for anything.
Now, that said, I also had to examine the benefits and costs/risks of eliminating my feelings. At the time, I decided that since there wasn't really much of a downside to what was going on, there wasn't really any point in trying to get over her. Plus, allowing my feelings to stay had the added benefit of allowing for something to potentially happen if the situation changed.
Time passed, and I was content. But now recently, and inexplicably, my feelings have been causing a bit of undue stress and mild depression. And when I say "mild," that's what I mean. Not a big deal or anything, but pretty annoying to have to deal with.
Reexamining the situation, I decided that now the benefits to getting over her outweigh the costs and risks enough to warrant doing so. Yes, I lose the potential for something happening in the future, but the chances of that are so small that that isn't really a big loss.
Haha, and if you can't tell, I'm an extremely over-analytical person. Whenever I have a choice, I always, without fail, consciously analyze and compare my possible courses of action to logically determine which is the best one to take. The less I think about something, the more difficult it is for me to actually do it. But when I have a pretty good understanding of the likely consequences, I feel much more assured and can go through with it.
As a result, I'm not a risk-taker at all. And I don't exactly think quickly, just thoroughly.