Ok guy likes me then ignores me ??!!?

ok this guy and i where sitting in his living room i started talking to him and he just looked at me and then said who are you walking to and he knew that i was clearly talking to him so anyways about 3 days later we where sitting on his bed wit my sister and he told my sister sierra to scoot over so he could sit next to me . He always lets me lay on his stomach or shoulder but when im at his house or around his parents hes ignoring me please help me i really like him