Why did he stop talking to me?

I met this guy and for the first time in years, i actually started to develop a little crush on him. We saw each other on friday and saturday for a few weekends at an event we both volunteered for and after the last day he text me and told me he really liked me and that we needed to hang out. For the week or so that we knew each other and the week that we talked after everything we cool. He would text me all the time. He was even excited for me to volunteer at another even so we could hang out. When i got there just totally ignored me and didn't seem like he wanted anything to do with me. At first i though it was because he was busy and he had his friends but then he just stopped talking to me altogether after that and when i would start a text conversation ( if he would reply ) it would be short answers and the conversation only lasted a few minutes. ( and i have an iPhone so i know when he has read my messages and he would read them but not reply ). Every week after that i have seen him he ignores me. What is going on? Nothing happened. I didn't say anything and neither did he so i don't know what is going on. I'm clearly not a guy. Is this a guy thing? I still catch him starring at me, is this what guys do when they like someone or did i do something wrong? We were even going to go to a concert together before he stopped talking to me. I'm just generally confused about the whole situation.

Do it

I'm a guy… This occasionally happens… Guys tend to react to things in different ways… By the sounds of it… If you didn't do anything then maybe something happened in his life that he didn't tell you about ( under stress about something, angry (most common one) about something, etc.)
just be honest and ask him what's going on. If he is a decent guy he will tell you