Is it normal that my boyfriend’s ex wife is secretly living with him?

So I recently rekindled my relationship with my boyfriend, he has children in uni and a small child. He is divorced and he can see his kids only during the summer or holidays.

I recently discovered that his ex wife is currently in his house with him and the small child now as the other kids started uni.

He never mentioned to me that he was with her in the house. I noticed something was wrong as he never invites me to his place or he doesn’t reply to my call at night but call back the next day always outside the house.

Am I unreasonable to not like that at all? How do I approach the situation? He doesn’t know that I know she is there. Please help.
Is it normal that my boyfriend’s ex wife is secretly living with him?
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