[Condoms] keep breaking between just us.

Hey there, I am super confused.

My new boyfriend and I have been going at it for about three weeks now. We started with Trojan magnum (because that's what I already had, and they're not old), but he said they felt way too big. We then went to the normal sized trojans, which he liked better, but they still felt kinda baggy for him and a few broke (I'm on bc). Recently I bought some durex sensitive which are his favorite so far but now we've had some break too.

He's not ready to go no-condom yet, but I'm kinda annoyed starting with one, which feels so meh to find out he's cum in me anyway. Neither of us have ever experienced condom breakage in previous relationships. I watch him put them on and it seems normal. His dick is very normal sized and I don't feel we're being too rough.

What on earth on we doing to these condoms?