Am I allowed to tell him who he can or can't talk to?

my boyfriend was friends with this girl who I don't like. I knew her for a long time and she's really mean to me and sabotaged a few things for me. My boyfriend knew her before me and stopped being friends with her for awhile after meeting me but after a few weeks became friends with her again after I told him not to talk to her. I've always felt he might have liked her but he says he doesn't feel that way about her. They talked and hung out one on one and my boyfriend tells me everything they do. If he talks to her one day he tells me the same day. if they go out and do something, he tells me same day. I got mad at my boyfriend at first and he came to conclusion that im jealous of her. Each time my boyfriend told me stories about what they did or him speaking to her I had to put on a front and not get mad to avoid getting called jealous. I've began overthinking and just broke up with him because of it.

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1 y
im just asking for future reference
Am I allowed to tell him who he can or can't talk to?
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