I recomened next free period that you go talk to him again, especially if hes on his own, even if your mates are there too (he'll get the hint if hes not stupid). Most guys will realise the fact that you like them pretty quick especially if you would rather sit with them than anybody else (ie. ur mates) hell then be hooked on you. Altho another way to tell is to get to the room first before him and sit down on your own and see if he comes and sits with you. you'll be quids in either way. oh yeah and btw he sounds like an alright bloke.