Fat experiences

First of all, no matter what, he should not be cheating. Secondly, if you purposely decided to diet and change your personality he may need to break it off. But since your personality did not change, and you could not help losing weight, he should have accepted it.

From what you describe, it is clear that your fiancé was only interested in one thing: not you as a person, but fulfilling his sexual desires. If he was interested in you as a person, he would have supported you. Even if the feederism aspect is so important for him, it is not an excuse to cheat on you. I'm sure there are ways to incorporate feedism elements in your relationship, even when you are losing weight, especially since you still have the desire to gain weight. (It's your desire, right? Not his that you are giving into to please him?) He could have supported you in this instead of moving on to his next prey.

It is really his loss. I hope that you find a trustworthy man soon who really deserves you!

There is never an excuse to do that to a partner or a friend. I'm pissed with the both of them, without knowing them!

Also so that you were treated so shabbily. This really isn't a fat thing, this is people (them) being selfish and hurtful, and sadly it does happen way too much :-( (a thin friend of my wife went through close to exactly the same experience).

Sorry to say this but if the guy is only interested in bmi then your better off out the way! I am a FA and a feeder and would encourage any lady to gain weight. But not against her will or if health issues dictated weight loss was required. There is so much more to a relationship than the size of a person. I am sure you will find someone genuine to help you to your goal of 400 at 40.....