Her ex husband is calling her everytime is this normal? PLEASE advice?

So i'm dating this woman shi is divorced with a daughter, we are having good times and stuff, but i have noticed that her ex husband is calling her, not only this but when she answeres he ask her where are you or what you are doing, after hanging up he call her video call, and when we drive to her house she keep saying chose they other he might be in front of the house, i ask her did he ever came to your house she says no, he talk to her about her girlfriend and stuff, but i do not understand , she is telling me i do not wanna tell him i have a boyfriend because if he knows he will stop letting me see my daughter or if i'm busy and i want him to have her he will refuse to, can you please advice, i am not comfortable i want a peacfull realtionship and not this, what do you think is this guys?

Her ex husband is calling her everytime is this normal? PLEASE advice?
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