I'm in a relationship with a man that take care of a kid that's not his what am I to do?

Farah_officially
I've been with my boyfriend for 5 years and in the beginning he told me upfront that he does of a son but its not really his but he take care of him and treat him like his own son and at first I wasn't really that thrilled about it but I accepted it. But through the years we've been together i just get more upset and frustrated about it because the little boy that he calls his son is 10yrs old and he doesn't like me and he shows me no respect at all. And the mother of the boy doesn't like me either the mother of the child been in & out of jail she's insane. and one day the little boy came and spent a week with us and he made it clear that he doesn't like me at all he yells at me doesn't listen to anything I say and when I tell my boyfriend what he has done. My boyfriend tells me "oh he's just testing you" and the boy's mother has no respect for my boyfriend nor appreciate what he has done. And now I'm 6 months pregnant and my boyfriend feels it would be nice to let the little boy know he's having a little sister/brother and I'm not with that. i just don't know what to do anymore I feel like at the end im just going to have to break up with him Am I wrong for feeling this way I know my boyfriend has a good heart but I feel like the mother of the child is just using him. she's selfish and unappreciative of what my boyfriend does for her son curses him out and everything im just getting fed up with it
I'm in a relationship with a man that take care of a kid that's not his what am I to do?
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