Am I over exaggerating?

Okay so I have no friendship with any of my exs. Even with my exs that I ended on good terms, we just don't talk out of pure respect for our SO. Well I've been with my SO for almost 5 years. He plays a big role in why I don't talk to my exs (he use to get jealous) now he doesn't because I think he knows that I don't care to talk to them. Not to sound mean but why would I need to speak to them or have them in my life. Well recently he became friends with his ex on Facebook. And I got extremely upset. I was calm about it but I was upset because why after 5 years do they suddenly become friends on Facebook. I asked him to delete her and he said no that it's no big deal that they are friends that what they had was a long time ago. I'm currently (33 weeks) pregnant and I just don't like it. Like I respect the fact that he didn't want me talking to me exs and they know that (my exs) so they don't talk to me either. But he said I'm being childish because I want him to delete her, he said we're having a baby why does it matter if I have her as a friend. And well I just don't know what to say. I'm filled with rage I have been for the past day because he laughs as if it's a joke and it's not a joke to me. Cause honestly I feel completely stupid. I have no idea if they've talked or anything because his phone has a password and well he's never let me see it but it's never been a big deal till now. Even though I know he dated her almost 5 years ago I don't like the idea of them being friends because other than me she's the only one he had a lasting relationship with but it was on and off. So it makes me feel insecure I honestly feel like if he doesn't love me like who does this crap or makes someone feel like this. I want to literally beat the crap out of him cause I'm so upset. Am I over exaggerating because I want him to delete her? I need advice I'm literally going insane. 😩

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