Need a women's opinion

Okay so my boyfriends said today to me "my big" he was doing this while he was hugging me. From behind.... right way I got mad because I assume that he was calling me bug as in fat. I'm a person who is cubby and insecure about being cubby. I started crying because since we have been dating I have always told him you can say so many things to me and they will not hurt as much as making fun of my weight...

Later we talk and he said he was talking about my butt.....he always touches it... I told him that it's not what he said call he said was "my big". He keeps telling me that he didn't mean it that way... but ever last week there was a little situation about no expressing words and it turn into my weight again.... I'm just really hurt and sensitive.

What do you lady's think?