I agree that we don't know that the OP is even fat. "Hot" in Hollywood means being a size 0. Maybe she's a perfectly normal weight for her height but she's doesn't look like Nicole Kidman.
If he said she needed to have a breast enlargement before he married her, would we even be having this disccussion, or would everyone have just called him a pig? There's so much fat prejudice right now, we just ASSUME she's fat, and ASSUME she overeats and ASSUME she's lazy, instead of ASSUMING he's a pig.
Let's examine him: she's good enough to f- right now, but not good enough to marry? She's good enough to be seen in public with him now (we assume the go out on dates), but not good enough to be seen with him in public with a ring on her finger? This is sounding like he's a pig. Because either she's not fat and he's trying to control her or weasel out of marrying her, or she is fat and he's just using her until something better comes along.
Do fat women deserve to be used just because they are fat? Didn't white men once use black women without care for their well-being just because they were black, and therefore seen as inferior and not afforded the same regard as a white woman? If you start in on "yeah, but she can lose weight, so it's not the same thing," then account for the documented fact that 95% of ALL people who diet fail to keep the weight off three years. Is everyone weak-willed or are there things about how our body works that we haven't discovered yet, and thus we haven't found how to make it keep weight off? Even if she lost weight for him, she's almost certain to have it all back after the wedding anyways. Would he then divorce her for it?
Daddy's just got himself a cow and free milk. He's just using her weight (whether it exists or not) as an excuse to not have to marry her. He likes shacking up with her and getting free sex and the other amenities of life without having to risk anything with marriage. When some other woman comes along with better amenities (whether they be looks, size, or income), he'll ditch her so fast it'll make her head spin.
He's only looking out for himself and the faster she ditches him, the better her life and self-esteem will be. There are plenty of men out there who like women with curves; she need not settle for some man who tells her she's never quite good enough to deserve what other, "better" women expect and deserve. That's called mental abuse.