Within four years, Google hopes to have the autonomous vehicles commercially available and citizens throughout the U.S. regularly riding in them, Urmson said.

Google Inc. threw the auto industry another curve ball Wednesday, saying its autonomous cars should be on public roads within five years without having to drive through a thicket of regulatory red tape.

Both sources are from 2015, the first one from january, second from last week. I think it unlikely (<10%) that they are going to overperfom by more than a single year, and very likely (70%) to take at least a year longer.

Remember, its not only a technological problem, but the inertia in a vast system. Insurance+lawmakers etc need to finish their side as well.

Elon Musk, someone who can reasonably called domain expert on innovative car systems, gives the same range:

The three-year estimate, Musk says, is when he thinks the technology will be ready. It could take longer for government regulations around the issue to go into effect. He acknowledged that it will take time for regulators to say "it's okay to go to sleep in the car" -- maybe another one to three years.

Note that I only looked up Musks opinion after I wrote the first part.

Study existing literature. http://en.wikipedia.org/wiki/Bent_Flyvbjerg this guy got a lot of good press in germany, apparently he has written extensively on big infrastructure projects and cost overruns. I find Megaprojects and Risk: An Anatomy of Ambition

Keep in mind that Amelia herself is a powerful witch, and thus "you are not meant to know" is kinda-sorta expected in those circles, and a most valid excuse for basically anything weird or unexplainable.

Canon!Salazar is a bloodpurist already. He and the other founders of Hogwarts have a big row about it- who should be able to attend Hogwarts? Only the pureblooded! Apparently this is the reason why he built the chamber of secrets in the first place... Awesome theory otherwise.

Bad data. I have not read the original research study whose findings were later likened to those of cocain, and am a bit suspicious how similar they actually are. "study the neurology" instead of "neurochemistry" would be more accurate, I guess.

Well OPs stated goal is to end the strange behaviour they have around their ex, which takes away their agency. While a common problem within humans, it appears to be solved mostly with time- eg it is unsolved. We have some (bad) data available that this is actually very similar to some kinds of addiction. And while certainly addiction is nowhere near 100% curable, (or we would have heard of that by now) my prior for "having found some better than placebo treatments for one of the major drug addiction (cocaine)" is 70-80 percent. So I do give "investigate this line of thinking, speak with experts" at least a high enough investeded-time/chance of success- ratio to be worth considering. That was my thought process for using rational, is the explanation satisfying?

Sorry I failed to make myself clear. To put it simply back: it feels as if you are in pain or intoxicated, because thats exactly what it is, http://www.pnas.org/content/108/15/6270.short for example. Your system 1 is in desperate need to get its fix OR stop the hurting, even if system 2 is fine. The obvious way to combat it and your accompanied loss of agency is to precommit in some way to stop being around them, but also to ignore their wishes in the future. The way this happens for a lot of people is rationalizing undesired qualities to their expartners, having strong peer pressure etc. Because system 1 is so strong on this front, depending on your own stability, it can actually be dangerous to fight it too much with system 2. For the whole system 1 against system 2, mindfulness meditation is useful.

The question "is heartbreak the way humans experience it right now a good thing" is one of the more complex questions about the human condition,yes. My mental modell of all that is kinda like the following:

On an neurochemical level, the way "love" stimulates the reward-centers has been likened to "cocaine".Its an extremely strong conditioning, addiction even. So of course your brain wants to satisfy that condition by all means possible. If we have a look at popular culture, its kinda expected to have extreme reactions to heartbreak: people fall into depression, start rationalizing all kinds of really crazy behaviour (stalking, death threats, lifechanging roadtrips) etc etc.

To avoid all that you have to thoroughly impress on your emotional side that its over: thats why some people do the whole "burn everything that connects me with her", others just overwrite that old emotion with new (irrational)emotions like anger, hold a symbolic funeral, repeat it to youself everyday in a mirror etc.

Unfortunately I am not aware of studies about optimal treatment of heartbreak, but common wisdom is: NO contact at all in the beginning, allow yourself to grieve, find solace with friends/familiy, and somehow redefine your sense of selfesteem- take up painting/coding/comething you have always wanted to do. If one wanted to go the rational route: research neurochemistry, find out wether its really like cocaine-addiction, do whatever helps with cocaine-withdrawal. (or the other most closely related drug-withdrawal).