Have I done the right thing?

I had a party about a week ago, at the party one of my guy friends was dared to kiss me on the cheek and he did, But i was in a relationship at the time. My boyfriend (at the time) then got all jealous and told my friend that he couldn't be friends with me.
I got really angry when he did this cause im quite close with that friend, so i broke up with him.
My ex then told his little brother what happend and now his little brother teases me, and although his little brother is 2 years younger than me there teasing still makes me feel like i did the wrong thing by breaking up with my ex. Did i do the right thing by breaking up with him?
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Have I done the right thing?
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