What to do?

Okay so I stay at my boyfriends family’s house on weekends cuz that’s the only time we get to see each other, but on Saturday he went to work with his brother for a little and then when he can back his “uncle” was there with me alone with his sister and two of his nephews his “uncle” brought home pizza and I ate two pieces and the he said “there is more of you want” and I said “no I’m fine I’m full after the two I just ate” and then he has the audacity to say “well you are eating for two now” and I’m not pregnant or anything. It pissed me tf off and I told my boyfriend and he said he was gonna say something but I told him not to and like it’s not the first time he has said something like this which sucks but like I have no idea what to think or say to him cuz I’m just so phased that he would even say anything like that to me.

Like I’m not fat at all, I got a little muffin top but that’s about it and he doesn’t even see me with tight close on cuz I don’t feel 100% comfortable with my body or even like that around him. Someone tell me why he would think that or what you think about it.