Why does my relationship that ended two weeks back makes me question myself as a person?

My ex (27M) and I (28) broke up two weeks back due to distance and constant bickering. He didn’t want to work on the relationship anymore and I had a hard time letting go. I now in my heart know it was the right decision but why do I feel so guilty. The way he treated me towards the end was so cold. I questioned myself a lot and blamed myself. I go through everything in my head like if I had done that or if I had done this. I’ve never felt this way in my life. Not about him or the relationship but just in general. I really am starting to believe maybe I’m one of those people who is not meant to find their partner to do life with. I’d really like to know if anyone has ever been through this before. I really feel unworthy of love. I’ve always tried my best given my all. What more can I do? What more can I say? But the one thing I sure as hell don’t regret is moving abroad to better my career and life. I’m proud I didn’t stay behind for love. My career is the only thing I can actually control in my life.

Why does my relationship that ended two weeks back makes me question myself as a person?
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