out of curiosity

i need opinions !!! i have been with my boyfriend for about a year & a half now. he has a 3 year old son with his ex girlfriend. i got into the relationship knowing he has a child & knowing she (baby momma) might have a problem with me being with him. they have split custody of their child. when she drops the child off or picks him up she always comes in wearing booty shorts & clearly is bra-less. or when my boyfriend picks up his son from her house he said she’ll come to the door with no pants & just a shirt because she’s waking up from a nap. am i wrong for thinking that’s mad disrespectful?? he has no interest in being with her anymore & he’s made that perfectly clear to me. i trust him but idk if i trust her. am i over thinking it? she’s obviously comfortable with him because they have a child together but i’m thinking this is a line that shouldn’t be crossed? i’m curios what everyone thinks