Is this a red flag???

My partner of 2.5 years has 3 previous kids and I have 1, we had a baby together back in march.. anyway fast forward, he has me blocked on all his social media accounts because “he doesn’t use them”.. then the next thing is his ex from the first kid reached out to him and invited him and the 3rd kid to the 1st kids birthday party… no one else, just them 2, to me I think it’s unfair like he has another 2 kids plus a partner aswell 😞 I guess I was just blind sided because I had a good relationship with the 1st kids mother aswell.. (there’s been history of them cheating together in the past)

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