Why would he leave me after I found out he kissed another girl and why would he say he would go with her?

Daniel and I have been together for almost 2 years next month. At the beginning of the relationship everything was going well, until July or August 2023 came along and I found out he was flirting with two girls who he said one of them was his brothers girlfriend. I even found out Daniel would say he didn’t have a girlfriend. He even made a promise saying he stopped looking at half naked women on line, to respect me and the relationship. Daniel would still see them and even said to my face that he wasn’t. There was a time where I would ask him why he was doing all of these things and if I was enough. I even asked why he would act single. Daniel would say I was toxic , imagining things , inventing things, etc. I stopped asking him for answers and took matters in my win hands. I made an account to see if there was more things and there was. He would offer them flowers, he would even flirt with them. I deleted the account cause it hurt what I saw.
June of this year comes along and I told him about everything i saw. He got mad and said I never trusted him. When he’s the one who would flirt with girls and act single. Daniel starts telling me that he was only joking with them and that he wanted to be their friend. Than tells me that he didn’t want to anymore because they wanted to be with every guy. I still didn’t believe a lot of things he said. So I talked to the two girls who know him, and one of them said he did kiss someone.. and would even talk about an ex he really loved and hurt his feelings. Yesterday night he gets mad at me and says I ruined everything and got him in trouble. Daniel even said I ruined the relationship, when I would ask him about all of this he would say I was toxic. Daniel then says he never wants to talk to me in all his life, that he hates me and said that I’m immature and a hipócrite. He even said I’m the worst thing that he had in his life. Daniel even says he rather be with the girl he kissed… he says I ruined the relationship..

Why would he leave me after I found out he kissed another girl and why would he say he would go with her?
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