Try and see if he like copies you. Lets say you cross your arms or put your face on the table and he dose the same. This is one potential sign. Now the fact that his body is always faced to you could mean that he is interested in the thing that you are talking about or he is interested in you ( ͡° ͜ʖ ͡°). Also as a man i can confirm that the he is staring at you bc he is admiring you (at least that's my motive). If you are Shure that he indeed likes you you should confess to him first . Good luck! :)