Is it normal for my long distance boyfriends baby mother to visit and sleep over almost daily?

So I've been dating this guy for nearly a year and he has a 1 year old son he coparents with his ex. I started to notice over time that she's at his house almost daily and spends the weekends (overnight) there so they can do family time with their son. When she's over for the weekend he somewhat goes near no contact with me and if he is around it's usually late at night while she's in his bedroom (in his bed) w/ baby and he's downstairs on PC gaming with me. On a few occasions I've ask him if they could do either Friday or Saturday together instead of Fri-Sun so he and I can spend time together/do weekend activities from time to time but he told me weekends are nonnegotiable. I've never seen or heard of this "style" of co-parenting and although I've told him I find it weird and a little uncomfortable she's at his house in his bed at 3am while he's gaming with me he says he doesn't mind her being there and her current living situation is rocky. Im just curious is this normal for the new generation of co-parenting or is this a lack of boundaries?

Is it normal for my long distance boyfriends baby mother to visit and sleep over almost daily?
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