Crush was all over me and now he is avoiding me when I try to talk. I dont know what to do?

I met this guy at work - his senior to me but he was always all over me and coming to my unit even if he didn't need to. He was always nice, supportive and flirty and would ask me personal questions for example about my family. Everyone noticed he liked me and one day he attempted to give me his number but I got shy. I'm a very shy person and it takes me a while to open up, especially if there are people around. I recently asked another colleague for help because he was busy and he told his colleague to stop talking to me. After that I was on holiday for a week and he had a holiday after me When he came back he called me over to look at something but then told me to leave him because he was getting distracted. People noticed him getting flustered. But since then he won't talk to me about anything, including work. I asked him about his holiday and he was vague. Before where he would find any excuse to talk to me or be around me has gone. I feel like he's doing things to get me to talk to him but only to be rude to me. Yesterday he didn't do something, so when I told him he said "took you a while to notife" with a death glare. I apologised to him if I had been rude but he said "you haven't done anything wrong. See you later" I don't know what to do. I tried to show him I like him and I apologised for something i don't know what i did.

Crush was all over me and now he is avoiding me when I try to talk. I dont know what to do?
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