How do I deal with my partner who never loved me from the start?

I just realised my partner never loved me. He threw our relationship like it is nothing and just like that went with other girls. I trusted him and loved him so much, I always find execuses for him and I was the only one who was fighting for him but in return I got nothing. He left me broken and dont even care to ask how I feel, he just conacts me like everything is ok and in the meantime I know he is cheating on me. How can I get through this? How to act with him? I am so hurt.
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Everytime he put the blame in me for our fights and wanted to end the relationship because of me being toxic. He just didn't respect my boundiries many times and I end up feeling guilty.
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Can a person ever change?
How do I deal with my partner who never loved me from the start?
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