Should I give up?...

Why do I always feel like when I like someone I always get the cold shoulder? The guy I am interested in is becoming hard to get to know now. It seemed like everything was going great between us until it came time for him to go on vacation. He was suppose to come hangout with me before he left since we weren't going to get to see each other that weekend and he said he was coming but never showed up and I never heard from him but I figured he probably went to sleep. He still never apologized or gave an explanation and I never brought it up because I didn't want him to think it bothered me. Then he went on vacation and I barely heard from him at all. So for a whole week he literally ignored me which I understand you're on vacation but still you're not that busy every second of the day that you can't say hi. After his trip, he says he doesn't really talk to anybody when he's on vacation unless its his girlfriend or parents. I just feel like I try to keep the lines of communication open with him to continue to get to know him but I don't think he feels the same way. I was hoping that things would go back to normal once he came back from his trip but nope. I try to text him and it seems like it takes forever for him to respond back. I feel like I need to back away from this guy before my ego gets more bruised. It sucks because I really like this guy. It always seems like I have a hard time when it comes to finding a boyfriend. When am I going to find a guy who is interested in me to where he keeps texting me and wanting to get to know me? I always feel like I do more than the guy I want the guy to do more than me. I'm guessing its not my time to find that guy but if I'm lucky things will change and we'll start talking more. I can only hope....