Why are guys so weird?

Ok so i met this guy when we went out with mutal friends he got my number and started to text me everyday and even asked me on a date and always flirted with me then out of nowhere he stops texting me out of nowhere nd ignores my texts so i tought well maybe his phones is off and he was online on facebook and i start talkin to him there and he ignored me there to then i asked him wat his prob was nd he didnt respond. i dont wanna sound desprete texting him all the time i dont really care if he dosnt wanna talk to me but could he atleast have the decency of telling me why? ughh so why do you think he stoped texting me?