Why would the ex lie about having a gf?

When we split amicably back in July. It was because we were both so drained, (also tried for a baby for a year) just didn’t happen. Loved him more than anything. We were still in contact. He even gave me his new number a month later. Everything was fine between us... but I always said to him to please tell me if he ever gets a girlfriend so then I can move on and leave him be... I discovered last week he has had a girlfriend for the last two months... we argued because I wanted to hear it from him but got angry with me instead and now a week later he’s stilll demanding to know who told me. I was over it a week ago and deleted his numbers etc.. my question is 1) if there still in your life why would an ex hide having a gf? And why is he so so angry and desperate to find out who told me?
Why would the ex lie about having a gf?
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