It means he/she is embarrassed around you for some reason.
the reason why men do that is because they are shy while they in front of others
I am not sure entirely what you mean but there are lots of elements that go around in pairs, e.g hydrogen, oxygen, nitrogen amongst others.
That means that the guy apparently likes both of you and trying not to show it.
That she's ignoring you.
It doesn't like you
He's cheating on you
It means she does not consider them close friends, and possibly that he is annoying her.
She likes you, but her friends do not.
He doesn't like you
that means that your in a normal relationship
Like straight up ignores you? well, he maybe doesnt like you anymore?If you mean he like turns his head when you notice,he likes you.
When a person that you like sometimes ignores you an sometimes they don't can mean a few things. It could mean that the person is busy or it could mean that it the person does not like you as much as you like them.