Feel terrible using my boyfriends money

My boyfriend and I have a 10mo and her birthday is coming up. I’m a SAHM so I don’t have any income coming through. My boyfriend insists on me using his credit card to get stuff for our daughter’s birthday. I keep telling him no I’m not using his money, that I’ll find a way to pay. I don’t know why I feel so uncomfortable. Maybe it could be that my mom says that SAHM are leeches feeding off the government and baby daddies. But then she turns around and tells me that if I need money I need to ask my boyfriend. You’re probably thinking to yourself “well what does it matter what my mother thinks or says?” Honestly, no clue. But she’s said these things so much for years that I’ll think of myself in that matter if my boyfriend ever pays for anything. Even my gas, I’ll feel awful and like it looks like I’m just using his money. We’ve bickered so much because I hate when he pays for things.