My dad thinks I'm going to gain my weight back, is he being bitter or telling the truth?

I used to be very overweight, 6 foot 275, I'm hovering around 200 pounds right now but want to lose another 15-20. My dad told me I will probably gain it back since a lot of people do. Is he being bitter or just telling the truth? He's overweight as well.
My dad thinks I'm going to gain my weight back, is he being bitter or telling the truth?
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