I broke up with my ex cause he's still on good terms with his ex, and sweet on social?

I saw them having the same photo holding a maple leaf which is significant in their relationship. I knew it cause I was the guy's best friend and he tells me about his relationships even before we decided to step on to the next level. But, now we're on LDR and I can see him getting cozy with the girl on social. I broke up with him and told him I'm backing off for them to be happy. His response was silence. what should I do?
I broke up with my ex cause he's still on good terms with his ex, and sweet on social?
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