Bf making dumb remarks about my weight gain.

When I first got with my bf I was near 145-150 pounds. Next month will make our two years and I now weight 194 pounds. I went through a depression and a lot stress after having to be forced to be independent while my parents got get out of the apartment we had when I was living with them. I was 20 years old at the time. Basically, my life changed drastically from one day to another. I had to stay in hotels for a few days until I found a place to stay(rented a room with a friend) ever since I didn't have the bond with my mother since she is going through a hard time as a single parent with my 4 siblings that are younger than me. Well long story short (fast forward) December 2016 I moved in with my Bf and his mother so I wouldn't have to worry about rent so I can pay a car payment. (It was his offer) he said he wanted to help me get back on track. So since then like I said I've gained weight and now he's starting to make dumb remarks about it. Before it will say it's cause your stressed out that's why later on you will get out of this phase. But now he tells me oh your fucked your heavy cause I have a fucked up DNA that runs in my family because we are all not skinny. 😭😭😞😞 I was speechless and then I go to the store for a water and chocolate and asked him if he wanted something and he said just a soda. When I get back he told me give him chocolate I said I thought you didn't want one but go ahead and have my half and he just took it and said nah I want the whole thing you don't need it. And I was like why cause I am fat now and he said yes like shamooo (think that's how you spell it) let me remind you I have tried losing weight so bad and only lost 3 pounds in 5 months . I eat better than before and exercise when I can. At my job I am on my feet all day running back and forth (caregiver) So I am active unlike a couch potato! I don't know what to do. It hurts me for him to make fun of me!!! Any advice??