Why did he blame me for ruining the relationship, when I wasn’t the one who jokingly flirted with other people?

My ex boyfriend (23m) and I (25F) were together for 2 years, almost 3. Around August of 2023, problems started surging between the both of us. The issues started happening when I saw how he would flirt with a girl and her friend. I confronted him about it, he just told me how he was just joking around with them, and how one of them was dating his brother. Daniel would “ jokingly” tell them both how he was single, even how he would buy them BOTH yellow roses, how he would take one of them out to eat a treat. Daniel would still watch OF girls, when he told that he stopped due to love.

A year after, I confronted him about those little jokes of his, he just told me “ I wanted to see if there could be a friendship formed with them “. Around the month of September or ends of August, I talked to both of the girls. One of them told me, Daniel kissed one of her friends, that girl even told me she wasn’t dating Daniel’s brother, he was just her friend. The other girl told me, I wasn’t the only one he lied too, how she would treat him with care or love, she even said she treats her single guy friends with care/love.
At 10pm, Daniel confronted me and said I ruined everything, he even told me I put him in a serious problem. The argument escalated to him eventually saying how he felt hatred and that he was going to go with the girl he kissed. That is not all, after all of that happened, it came out of my heart to want to gift him money, not a lot. Daniel would get mad when the money never arrived in his bank account and started saying how I’m a liar and how I never cared about the relationship. HE EVEN SAID “I begged you to change for 2 years and you never did” . Daniel even said I would block those two girls and the OF girl who he told was Inlove with her, after I changed. Daniel would always tell me that I ruined everything, and said “ you’ll never change , I’m still here being stupid waiting for you to change and be the same person”. Every time I would bring up the same topic.

Why did he blame me for ruining the relationship, when I wasn’t the one who jokingly flirted with other people?
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