I dumped my college boyfriend because I was jealous of another girl
Was that really the reason you dumped him?
I saw him with another girl at the party. I was so angry with him for this.
It is frustrating to be broken up with for a trivial reason. You should not be upset if he was just talking to someone.
Am I not allowed to be upset for this?
I'm just saying you might have jumped the shark a little too quickly. I believe it pays off to be patient and honest with your partner, to give them a chance to explain themselves. It's not always the worst case scenario.