How do you know if he is not for you?
He tries to boss over you or control everything you do. He always chooses what you should do when you're with him. And if you choose to do something else, he gets angry or sulks the whole time.
How do you know if he's not really into you?
You feel tense around them, even when they're kind to you. A common thing that happens when someone isn't right for you is a pervasive feeling of tension, even when no reason has been given to be worried or stressed near that person. If you find yourself constantly on edge around them, they're not the one for you.