What was the biggest or best lesson you learned from your first relationship/breakup?

We all learn lessons from what we do. However, in relationships or breakups, you might learn your most valuable lesson in life… What was the biggest or best lesson you learned from your first (serious/real) relationship or breakup?

If you haven’t had a relationship or breakup, what was the biggest or best lesson you learned from others’ relationships/breakups?
What was the biggest or best lesson you learned from your first relationship/breakup?

My answer:
In my first real and serious relationship/breakup, I learned that I need to have boundaries and that I cannot fix people or a relationship that simply can’t be fixed. I struggled with saying “no” and always putting in too much effort for something or someone that didn't do the same. This lesson helped me navigate through my current relationship with ease.
What was the biggest or best lesson you learned from your first relationship/breakup?
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