Preferences in partner?

So I’ve gained liked a few pounds more than I have wanted the past year or so. My goal is to loose about 15lbs. I love my body either way, like right now I am a little curvy, I have more boobs and more butt but I’m still confident being curvy and it does make me feel more “feminine”. If I lost say 15-20 lbs, I think I would feel more mentally stable because I would be working out more, but I would be muscular and pretty skinny and I would not be very curvy. I love myself like this as well because it would make me feel strong and confident. For me yes 15lbs does make a difference even though it does not seem like that much, the way my body is, you can tell if I loose or gain even like five pounds.

Anyways, I was talking with my fiancé and I told him I maybe wanted to lose around 15lbs, so I was going to hit the gym a little more. He said okay that’s fine but maybe stay away from like jogging and long distance running and maybe do some workouts or lifting? I asked him why so specific? He said okay loose weight to feel good but just don’t loose your booty? This concerned me a little so I said you don’t like me at certain weights? And he said he likes and loves me either way but his preference of me and my body type is for me to have a little more booty. Is this a red flag? I mean we all have types to some degree right? For me personally I just want to feel good, working out makes me feel good, I love myself either way.