I gave him my number and he didn't text me. What should I do!?!?

ok so ive been talking to this guy on Facebook and he said "I gtg ): " and I said "well maybe you should text me sometime" and gave him my number. he said ok with a ;) face. lol. this happened two days ago and he didn't text me yet. should I give up or just keep waiting? I'm so lost! I think I really like him! Please helpp!