There is a saying that goes "We repeat what we don't repair", and this actually applies to every relationship that we have.

We subconsciously want to relive our childhood traumas through the people we pick for relationships so we have more chances to correct it.

If we don't figure out the lesson, then we'll just keep reliving the same situation through multiple relationships.

Once you understand that you are meant to learn from that experience, and if you have learned your lessons, that wound will start to heal and your issue will magically disappear from your life.

And that’s how it serves your own conscious evolution, by turning pain into wisdom.

“If you accept that a relationship is here to make you conscious instead of happy, then the relationship will offer you salvation, and you will be aligning yourself with the higher consciousness that wants to be born into this world.”

— Eckhart Tolle