How do you accept and internalize the hard fact you were just a source of validation and nothing more?

So I was in a one sided relationship where I constantly gave more then her. And I constantly struggled with everything that came rushing to the surface after it was over. She would say you make me feel so loved and that was the general theme everything I was doing made her feel good or showed I cared but for the most part I was neglected. As if I didn’t matter basic conversations didn’t even exist she never seem invested in my life, I always had to tell her stuff she never was interested enough to ask. Something that sticks with me is why are you deserving of my love and care if you don’t like anything about me. When the end of the relationship came if you were an outsider you would legitimately question why date this person because she wanted someone better looking, that wasn’t on the spectrum, that didn’t like sports, rock music when I say everything about me she disliked she was creating things. Months later I was going through autistic burnout from the processing and I called her to explain stuff because we shared finances and I had to take a leave from work. She goes that’s pathetic if you’re still upset over the relationship and if I crash and die on the road because I can’t switch my tires it’s gonna be your fault that was the final end point I guess you could say that was the final point where I absolutely stopped talking. It’s one thing to be vile in a relationship but even after I couldn’t process that, when she called me pathetic for going through autistic burnout I broke down in tears asking what did I do to deserve this why, why are you treating me like this this isn’t right she deflected and didn’t respond.

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Sometimes I feel this this complex and has so many layers and each day I think of a different layer
How do you accept and internalize the hard fact you were just a source of validation and nothing more?
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