Guys, Is it okay to call an ex to apologize when your in a relationship?

So me and my boyfriend took a break and he started talking to someone else he ended up cutting her off because he wants to be with me well the other day she came up to me and said my boyfriend called her but she didn't awnser when I asked him he said he just wanted to apologize to her for making her think he wanted her but I dont see why he would even want to do that when she moved on to another relationship? Is this ever okay I dont think its acceptable considering I've asked him not to speak to her. Guys do you think it was innocent or was this something I should be concerned about?
Guys, Is it okay to call an ex to apologize when your in a relationship?
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