He can't tell his mother no

Yes I know he's just my boyfriend, but we've been dating for 10 months; and we're very open with each other and tell each other everything. My boyfriends mom never talks to him unless she wants money, my boyfriend forgot to mention how he gave her $100 today and was complaining how he has no money. My boyfriend bought me a camera for my upcoming birthday, and his mother called and needed it for stuff for eBay because that's how they make their money because both of his parents blow1 their money ; so my boyfriend took them the camera that will probably end up broken or sold. Before anyone says I'm something I'm not, he's very honest with me; but he knows where I stand on giving his parents money when they never calling unless they need something, but I feel like he should've told me anyways. He doesn't know how to say no to them, but tells me no constantly. Is there any advice anyone can give me?