This guy I'm dating [ 24 M] started acting really weird about how I [24 F] looked like before I lost weight.

2 years ago I lost about 55 pounds. It's something I'm really proud of it, not only for appearance reasons but I become really into fitness, exercise, lifting. and over all living a healthier life style. I am 5'11 and I went from 205 to 150 and went from a size 12 to a size 6 but also gained so much muscle, stamina and went from a 28% body fat to a 18% body fat.
So about 2 months ago I started dating this guy. We actually met at a new gym I signed up for when I moved out of my parents home. The relationship has been going great and he's basically an expert when it comes to fitness and has actually given me tips and helped me improve a lot and it's cool to date someone who is into fitness as well. He also has a good job, seemed like a really nice guy etc.
So we were hanging out at my house a few days ago for the first time (usually I hung out at his house or did things outside of the house) and he was looking at some of the pictures I had of myself. Obviously I had some pictures of myself from before I lost the weight.
He started acting really strange about it. He commented about how he didn't know I was "so big" before. I was like yeah I lost a lot of weight. He then semi accused me of hiding it from him and remarked about how I didn't have these pics on my social media.
Yeah they weren't on my Facebook because when I became a teacher a year ago I cleared out most of my old photos to make it more professional. Just a personal choice I made since I teach at a high school. I wasn't trying to deceive anyone. I don't use instagram. And I never hid the fact the I had lost weight so I didn't really get the point that I "hid it" from him. Like I didn't go into specifics but I told him that a few years ago I really decided to get into shape.
So literally ever since he saw some pictures of what I looked like before I lost weight he's been acting so odd. He will randomly bring it up. He's literally gone on about how "different I look" and how "amazing I look now compared to before" He's said that if he had met me then he probably wouldn't have been interested and "joked" that he hoped I didn't rebound back. Even if it was true, who the **** says that?
The whole thing has just made me very uncomfortable. I'm proud of the weight loss and never want to go back to how out of shape I was before but I was really insecure about my appearance and body image back then andthis whole thing makes me think part of the only reason he likes me is because of my appearance and that he's very vain. Obviously I know everyone has their preferences but the whole thing has just made me extremely insecure and I wish he would stop talking about.
Am I totally over thinking this or am I am in the right?

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tl;dr: The guy I'm dating saw pictures of what I looked like before I lost 50 pounds and he keeps bringing it up and trashing how I looked like before.


Source.

Wow what a jerk! He should be praising you for losing the weight and be committed to make sure you don't lose track and gain it back. Not a very good bf in my opinion.