My ex has been telling people at university that I cheated when it was actually him. Why would one do that?

Today my friend from University told me that my ex who I dated for 3 months last year, was talking shit about me to about 12 people at my university at a party. When we dated, he cheated on me the entire time and I found out after he broke up with me (he said because he didn't want a serious relationship and didn't mention he was sleeping with other people.) I didn't cheat on him during the relationship. Why would someone do that? When we were together, I thought the relationship was nice and loving. He said I love you first and was the one to go after me. I really don't understand.
My ex has been telling people at university that I cheated when it was actually him. Why would one do that?
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