How can girls tell that a guy is hurt?

ZainabAli123
So recently me and my crush have liked each other for a while now the only issue is that one of the girls who I told happened to have started to play with my head like she would tell me that he has a girlfriend and that he is only joking and I should not be serious about him. I did have enough of it and plucked up the courage to take him into a corner and ask if he was taken why put on a show expressing he is single he told me this many times before that he is single I just didn't belive him. I told him I found it hard to belive as well but he responded with how else can I prove it that's what he said.

I guess the part about me not beliving he was single had been bothering him for the pass two whole weeks and it was just one of the girls he studied with in 6th form who told me that he is generally telling the truth about being single she also told me that he meantions me a lot when they talk about work related stuff.

I just didn't belive it I felt ashamed and embarassed but got the vibe he was trying to avoid me and ignore me as he was refusing to accept my help when i could tell he needed it.

I was burning with emense jealousy as he was making this other girl laugh and stuff but with me he was just being ignorant and acting as if I am not there eventually at one point I could tell something was wrong so I asked him and he didn't speak to me he just nodded his head but I guess i could just tell from his behaviour the fact that he was not smiling around me and the fact that he usually is always in my face or annoying me constantly this time he wasn't and I guess his eyes were the biggest sign to me as when I look or stare into them he usually does the same back but not this time I just want to know have I hurt him and what other signs should I look out for that he is hurt?
How can girls tell that a guy is hurt?
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