My [27/f] boyfriend [30/m] just told me he found his ex more attractive than me

Hey there! I'm new to this and I really need some advice.
TL;DR My boyfriend told me in a moment of doubting us that he always thought his ex was prettier. Help?
So basically what it says in the title. We've been together for a year and lately have been having sone issues lately and it felt like his sex drive had tanked a little. I felt bad about myself, he was often acting selfish or dismissive but I love him, so I really made an effort to show him I care. We live together and I work 12 hour days for no pay at the moment at a hospital, trying to better my chances to get a residency in our city (I graduated med school last December), because he doesn't want to move. Since I'm not getting paid at the moment (probably for another 3 months - I already have a job offer in research in September but won't be able to start until then because that's when the position opens uo and also I'm already working 12 hours every day already) he agreed that he'd pick up most of the bills and I'd contribute as much as I can to groceries and generally clean up around the house. That was the deal. Now I get home around 7 every night and I do pick up and do laundry and such...I try to stay on top of it, but it's not as easy as when I was just studying, I just don't have enough time to do everything. He's been kindof annoyed with me for that.
I also have been kind of not eating as healthy as I used to/found much time to work out, so right now I am what you would probably call skinnyfat. I'm 5'6" and roughly 128 pounds probably, so I'm just not as toned as I used to be. I also used to have an eating disorder (that he knows about) that I've overcome in the last years. Honestly, I was actually pretty happy with my body. I have a classic hourglass body, neat, tiny waist, nice boobs and hips, a few tattoos, red hair, blue eyes. Think suicide girls, though of course I don't think I'm as pretty as those girls. On a good day I've been called the poor man's Emma Stone. I see guys looking at me in the street, I know I'm not terribly ugly.
Today though he had a moment of being unsure about us and suddenly went "I can't lie to you anymore, I've been telling you you're the prettiest girl I've ever been with, and it's just not true!" And then told me that his most recent ex was just much more beautiful, because she was "of finnish descent and athletic and tall" and I was "just ever so slightly not toned" also her face was prettier though apparently I do have "nicer boobs and smile more often" (which duh, she put him through hell, I'm not surprised she didn't smile much). He's also apparently bothered that even though I've lost some muscle tone he sometimes sees me snack. He said that I'm "ever so slightly too flabby for him" (I don't eat candy except for gummibears. Your girl here loves gummibears. I never would have allowed myself to eat them a few years ago and I've honestly enjoyed finding a few foods I loooove these past few years. My relationship with food has been so much healthier. I don't eat a whole bag just maybe 5 or 6 gummiworms every other night.)
It just crushed me. I've struggled to have a positive body image for so long and now I feel nothing but disgust when I look at myself. I don't want to eat anymore, I'm so afraid that I've become ugly without noticing it. I don't enjoy putting on nice clothes or make up at the moment (he also said his ex barely wore make up because she just didn t need to she was basically a model). I'm sorry but I DO look nicer with make up on!
I know this must sound incredibly pathetic, but I'm just so sad. He also said his sex drive has been bad because he's been thinking he'd rather have sex with insert random movie star or his ex. This all was a couple of days ago and since then he's said he really really didn t mean that and that he only ever felt that way after we'd had a fight and his feelings for me weren't there as much and that the rest of the time he thinks I'm the most beautiful girl.
What do I do? How do you get over this? I can't look in the mirror anymore because I'm so disgusted. My arms aren't super toned, I have some cellulite and my thighs are too thick. I never thought I was pretty, I grew up with a mom how told me that "oh well, at least you have a handsome face" and "well, you do clean up nicely no one would think that" and encourage me to get plastic surgery (European mother) amd lose weight.
I know there's more important issues but damn...I dated an actual model in the past and I have eyes and know other people are attractive and STILL my boyfriend is the most handsome in my eyes because I love him and that gives him a 100 points on anyone else in my eyes. Also I have never even thought about sleeping with other people and DEFINITELY NOT my exes while I was with him. :(


Source.

There is NOTHING "tl;dr" about that

Some days are like that.