How would I know if my flatmate likes me but he's too shy to ask me out?

He is an English boy the same age as me and I barely see him because he stays in his room a lot. When I do speak to him when we are both in the kitchen he just looks down at his phone instead of looking at me. He is handsome and I do like him but I wish he would pay attention to me more or be a bit more forwards.

How would I know if my flatmate likes me but hes too shy to ask me out?
How would I know if my flatmate likes me but he's too shy to ask me out?
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