My boyfriend hides than he talks to his ex?

ok so that woman sometimes talks to him especially about their daughter
i told him once i dont like that he talks to her and he should even delete or block her
but when something happens to his daughter its normal i guess that he talks to her
they dont meet... as soon as i know, i dont live with him but work with him everyday and at least once a week stay at his flat
he hides when talking to her... i know it
I hate it
I want him to know i accept that he needs to talk to her sometimes
Should i have a serious talk and say:i prefer to know you talk to her, than see you hide and lie to me?
He think ill leave him if i know he talks to her
My boyfriend hides than he talks to his ex?
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