Awww chika I've gone through that before and let me tell you it really sucks...But I realised that you should try to forget about him because in the end it's not really worth it... While you're trying to chase after one guy, you might not notice that there might 10 guys trying to chase after you...so try not to pay attention...It might be hard but eventually you'll get through it..and that guy will eventually realise how stupid he was....