If a guy chose another girl over you, would you give him a second chance?

Technically, me and the guy was not really dating. I'd a crush on him and we were just in the "just talking" phase but I made sure he knew how I felt about him. Long story short, while we were talking, he ditched me for another girl. That girl cheated on him and in the end, dumped him before leaving for college during the summertime. Whenwe came back from summer break, I'd lost 38 pounds and I was looking good and he started noticing. My thing is, I still like him but I can't get over the fact that he ditched me for another girl and I can't help but question his sudden new interest in me. What should I do?
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Do I've a legit reason to be mad or disappointed in him if me and him were never actually dating?
If a guy chose another girl over you, would you give him a second chance?
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