Why my crash started to be mean to me?

We had good relation but always been a bit distant. Always on professional - sometimes friends way. I thought he likes me so I asked him out but he did't agree, so I move on... Life goes on and I come back to my ex, he started to act mean sometimes even rude towards me. We work together so it's sometimes challenging. I felt that he was really interested in my 'relationship status' because he asked me every time he saw me how its going etc. I also think he avoiding me, but in the same time sometimes he come and tap my back when he want say bye. overall i think he wasn't interested (maybe a little , he never give us a chance and now he is mad? why? can someone help me understand)

Why my crash started to be mean to me?
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