He saw me talking to a guy with muscles and stopped talking to me?

I met this guy during classes together. He's... a little fat. But sweet. He was trying so hard to flirt with me and I thought it was cute. But after a few months of this, he sees me talking to another guy from a different class. He was pretty built and well, hot. But he was a complete douche that was full of himself. Had me cornered up against the wall with one arm by my head. Trying to be smooth and all that. Then my friend who was flirting with me saw that. And ever since then he stopped flirting with me. Even though I told him what happened. Not because he asked or that I felt like I needed to explain anything to him. It was just a funny story to talk about.
He saw me talking to a guy with muscles and stopped talking to me?
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