Should I stay or should I go?

When faced with an important dilemma I used to remain undecisive for as long as possible, wait until one of the choices was no longer available and thereby avoid making it. My new me is different. Or is it?
At least three options where to live next year. Number 3 is actually not an option, since my mother creates terrible atmosphere of stress and panic and even if she didn´t, moving back to one´s parents would be a step backwards that I am not willing to make.
But it is really hard to decide between number one and two, knowing whether you should choose one friend or another.. Whether to stick to the devil I know rather than taking a leap of faith and live with someone with possibly better kitchen hygiene habits. It is not about emotions(well it is, but it should not be), it is about me. Do I want to live with someone who makes me feel guilty or who makes me feel comfortable but aim lower? Important questions for which I have not yet figured out an answer.

Thinking about people

What defines whether we are a good person or a bad one? Is it the way we treat our friends and family or is it the way we treat our mere acquaintances or even enemies?
If the former - what if your friend behaves nicely enough to you but thinks you are a fool or a loser and does not trust your judgement one bit?
If the latter - are people obliged to be nice to everyone? Do you have to smile and be polite to people that are rude to you? Do you have to try to find common ground with everyone?
On the other hand it cannot work like my tribe good, the other tribe bad, let´s stab them in their backs, right?
Which makes me think that the boundaries can never be clear. And even when you figure them out for yourself, they will never match the boundaries that other people have created for themselves. In the end - situations necessarily lead to a mess, especially when someone judges others without applying the same standards to herself/himself.