Why do dumpers play victim?

my boyfriend has broken up with me because he's been unhappy in the relationship. He was pretty harsh to me in the relationship. He criticized everything about me, took advantage of me and treated me horribly. When I was given opportunites especially when it had to do with money he wanted to be apart of it without giving back. So after a while I turned into him but just only with the criticizing but I would also only do it when he did it to me. I did exactly what he was doing to me and after a short time he couldn't take it and broke up with me. The last time I spoke to him he told me he's been feeling like a complete different person without me and has been seeing other people. I should be the one that should be like that but i just didn't leave.

Why do dumpers play victim?
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