How can I stop being envious and jealous of the fact my current boyfriend and his ex been together since they was young?

Anonymous
We all in our early 30s. I’m kind of jealous that they been together for a little over a decade. They had a friendship and a bond and they have 2 kids together. I never stayed with my ex’s that long. They broke up last year when their child was 6 months old. I envy couples who known and been with the same person for years especially since they were young. How can I stop?
How can I stop being envious and jealous of the fact my current boyfriend and his ex been together since they was young?
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