Unsupportive boyfriend

So I’m a little overweight, “thick” if you will haha. My body isn’t too bad, but there are always room for improvements. I signed up for a personal trainer to get myself to a happy and healthier state. I told my boyfriend.. and he wasn’t too happy about it, which I thought he would be. The end goal/ challenge is to either lose 20 pounds or 6% body fat. He said I don’t need to lose 20 pounds and he doesn’t want me to go through with it. I don’t know whether to be happy/ appreciative that he likes me the way I am or discouraged because he’s not encouraging me to better myself. I don’t know what to think. I’m doing it anyway but wow.. usually it’s the other way around.