5. Communication is Extremely Hard
Sometimes guys don't want to communicate and I think that's also true for women. You may be going through a rough patch in your life and prefer to keep to yourself for while and so might he.
But it's a different matter altogether when he won't talk or open up to you at all. This may be because he doesn't trust you or see you as a 'safe' place (which he should since relationships are always a two way street).
If you can't get through to him about something as simple as how his day was or as important as if he wants to move in, it's time to re-assess the situation and realise that this shouldn't be happening.