Why my ex is concerned about me?

My ex boyfriend still messaging me even though he knew I got boyfriend he still even called my by my pet name and he always asked
" how's your relationship going on are you fine? " and he found out my current boyfriend is hurting me physically and emotionally he got so worried and upset too. The way he treats me as of now is the way he treated me before when we are still together.

He touched my heart lol. He was so good and kind still :(
Why my ex is concerned about me?
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