Ive seriously changed my mind!?

Ok ive been jus seein this guy casually for over a year now.. i like him alot and the reason i like him so much is cus when i met him he was going steady with another girl but we wer just friends and after a wile he broke up with his girlfriend so he could see me "casually" bcus i only wanted to be a friend cus he had a gf! but about 4 weeks ago he asked me up to his house for a cuple of drinks with his friend and i brought my mate, we had a really good nite. and at the end when we wher about to go home he asked me to go steady, but he was drunk so i said no and told him to ask me in the morning, the reason i told him to ask me in the mornin was i didnt want to make a fool out of myself and say yes and him not remember! but he didnt mention it to me the next day, ive met him twice since then and we spoke about it and he kinda said he thinks about me sayin no all the time to him and that it makes him think i dont like him. but i really do like him! i want to go steady with him but he doesnt show me any signs anymore! somedays he txts me other days he doesnt bother! hes a really nice guy and i do want to be with him but i no it takes alot to say it to someones face and i sort of regret saying no. what can i say to him that isnt goin to scare him off? im 19 hes 23.