mommamia22 – You need to talk to a rav or marriege consler ASAP. Nobody should put you down for gaining ten pounds (not even 100 pounds) especialy not your own husband.
He did not get any garantee for you to stay slim but you got a kesubah garanteeing you that he will treat you “like every jewish man would”, the ishue you mentioned is the most basic a wife expects from a husband.
For those who said he can divorce you, a husband can decide to divorce is wife if he dosen’t like her (aldough for someone to dislike his wife for puting up ten pounds shows that he is very shallow) but as long he is married he has some Torah mandated obligations including but not limited to the above mentioned ishue.
And even just to keep telling you that you are “fat” is verble abuse that you should put a stop to it.