My fiances ex won't stop texting him what should I do?

My fiance of 2 years had his daughter and I too care of her for a year and half and then he ripped from me and gave her back to her mother because she was being so malicious and then now originally they only once in awhile talked for updates on his daughter but this past week she messages him every single day complaining about money and her mother and stuff nothing regarding their daughter I don't know 🤷🏻‍♀️ what to say to him because I don't like it and he will just call me insecure always does when I speak up and so I don't know what to do I don't trust them because our first 6-7 months together they were together while we were and he pursued me I don't know know and then while I was 4 mo the pregnant they would meet up wherever he was working he claimed they weren't having intercourse though now we been together 2 and half years and went almost 2 years with her out of our lives for her to be back now what should I do? They chat a lot now but never inf root of me I feel like there is something else going on

My fiances ex won't stop texting him what should I do?
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