Did I feel jealous?

BlackX
Hi, so long story short, I am a 17 year old boy who has a crush on a girl. Let's call her Emily for now. So I feel like she likes me aswell, but I am not sure.

A few days ago, she said that she was about to meet up with a childhood male friend. She asked me to join aswell, which I said was fine. I'm not someone to become jealous fast, so I didn't really mind. It was as friends anyways, just hanging out with each other. So the guy came and they hugged and stuff like that. I didn't really care, but I did feel a bit awkward. The guy seemed happy to see her again and she was also happy to see him. The first hour went great, we played a game and laughed together. Then the dude started hitting on her, which really got on my nerves. He clearly was flirting with her, but she didn't seem to get that. She just laughed at him. Then he asked stuff like "Do you want to come to my house tomorrow? Just to hangout and have fun." That was the moment when I got pretty pissed off. I knew that he wanted something off of her, but she is just clueless. I started to make a few mean comments, hiding them behind a joke. Emily did notice my different behavior and I think that the dude did aswell. Whenever he was flirting with her, I just felt really angry inside. Honestly I just wanted to leave haha.
Did I feel jealous?
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