HELP??? GUYS PLZ! but girls can help too haha :)?

ok so i like this guy and last week it really seemed like he liked me but this week we aren't like that as much anymore.. so im afraid ill completly lose him so what are some good flirting tips? we already kinda giggle together all the time but i want to make him fall for me so what could i do? here's some stuff about him... He's really hot, he's a skater, he is funny like today in math we were talking about cars and ya its a long story but anyway lol he's really cool so please give me some tips!!!

Thanks a lot!!!!

xoxoxoxoxox