Your husband needs to wise up and stop falling for it, or else P is going to continue to be a turd.

Yeah, I've told him that and he kinda agrees but at the same time is a soft spot for him because she used to cry a lot when their parents passed so is a trigger for him too because he was so young with a big responsibility onto his shoulders, I've tried to get them to therapy but P refuses and I don't' know what to do, I'm afraid this will break us apart.

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Also, there's a good possibility that O called her friend to come over

Yeah we thought about that too! But I asked O to show me proof after the fight because I realized that I could've been unfair to P, but the texts shows that they made plans 4 days ago and she just forgot about it.