So I got really close with this guy over summer and we became such great friends. When school started he was that person I went to for guy advice. One day he saw me and when he texted me later he said I looked hot. He eventually started to really flirt with me and I flirted back. Then one day he stopped talking to me. I know that he is hooking up with someone. Now I'm just sad cause I no longer have him as a friend. It sucks that he doesn't talk to me. Should I just give up on him?