Sorry for the long post
Most Helpful Guy
Those articles are never accurate. Never.
They take what are common signs in any relationship, and tell girls that it's over, because that's how they sell next months magazine, the one with the cover story about how to land the guy you're crushing on.
Your boyfriend is going through a very rough time. He made the mistake of thinking that after a year, he could treat your relationship as a point of stability in his life, instead of treating it like a spinning plate which needed constant monitoring.
You should sit down with him the next time you see him, and explain that your relationship is not as stable as he seemed to think it is - Your paranoia is getting the better of you and you need him to re-affirm your relationship more frequently, in order to keep the paranoia at bay.
If he decides that his time is better spent dealing with his sisters actual real problems, instead of your paranoid induced self-imposed problems, then you might as well break up with him, because he should know that you're not the sort of person he can rely on in a crisis.