Why is ex being defensive?

after the break up, I told him why he broke up with me and I know he lied to me because nothing make sense. It’s been 2 months and found out he has a girlfriend. I told him and explain why he lie to me and not being straightforward to me. He said he still wants to be part of each other’s live after But he said “I haven’t been dating her so long I guess anyone I date that’s not you, I’m going to be the bad guy I love it!” And no he said don’t text me and lose my number?
Why is ex being defensive?
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