Why is my ex talking crap about me to my new partner?

My ex boyfriend broke up with me a few months ago and quickly found a new girl to start a relationship with. As far as i know they're still together.
We remained close for a while after the break up and even tried to be friends but things didn't work out because there was a lot of fighting and tension in our conversations.
After a while i decided to move on and eventually found a great guy i like a lot.
My ex boyfriend contacted my current partner via text warning him to be carefull about me because i get attached too easily and trying to convince my current partner something's off about me.
Why would he do that? And how do i react to this situation? Should i reach out to him and get an explanation or just let it go?
I'm so angry
Why is my ex talking crap about me to my new partner?
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