How would you feel?

My boyfriend told his brother that we are expecting another child..his brother gave him a lecture and at the end he says “make sure it’s yours”…that really pissed me off cause why would you say something like that? In my opinion dna test should be mandatory if you aren’t married and i’ve told my boyfriend if he wants a dna test I am more than willing to get that for him because I don’t sleep around and I know who my child’s father is PERIOD. But it really irritated me because WHY WOULD HE SAY THAT?! Then my boyfriend didn’t respond, didn’t defend me or anything, didn’t even say “she not like that” or anything of the sort. Like if his brother felt comfortable enough to say that to him but smiles in my face on ft and smiles at my baby , why not just be brave enough to say that out loud? What else is he saying behind my back to him? I just definitely don’t know how to feel about my boyfriends family anymore, literally not just his brother, his sister compares my child to hers which is weird and annoying, his mom ignores boundaries, his other brother didn’t even meet me and met my child once and then finally saw me and didn’t even speak to me and spoke to my child WHO WAS IN MY LAP…like i’m just so annoyed but i don’t know if i’m overreacting or what at this point. How would you guys feel? Honestly.