Why does my ex say he is embarrassed of me?

So someone was makin fun of my last relationship and I thought he told that person, when I asked him “why the hell you talk our personal shit?” He said he would’ve never done that since he is embarrassed of admitting he went out with me.
honestly I was the one who broke because of his childish nature and I know my worth is really high so really why be so harsh? I’ve always respected our relationship and he is just being garbage.
Why does my ex say he is embarrassed of me?
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