How devestating is it to self esteem to find out you were just a placeholder in a relationship?

Like I have had time to reflect on my previous relationship and seen videos on YouTube and the reality was I was used as a placeholder I served a purpose in the moment then I was discarded like trash

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I watched some videos on this and seen how it defined what I experienced in my relationship and it gave me chest pain because as a person who didn’t really experience acceptance before and thinking that I was only for it to be false and just be around only because I provide a resource of value
How devestating is it to self esteem to find out you were just a placeholder in a relationship?
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