...from a "gentleman" with whom I had a recent liaison?
"Urgh, this is horrible for me, and for you, and it could well sour things and I would hate myself if it did. But, I have to be honest. I said you were not my normal type, physically, and that is very true. I am really attracted to slim women, I can't help it and have tried before, with it not getting very far. I completely accept that circumstances and free time dictate how we are able to shape ourselves. I understand if you are hurt by this, and trust me I hate it having to be a thing. I hate the idea of men dictating to a woman what they should look like, and I am not telling you to do anything. I am just saying, in the past at least, this issue has got in the way. If you did feel like meeting me in the middle on this then I am realistic and not as demanding as you might initially think. As I say I totally understand that your circumstances and how they are not exactly kind in this respect. There are literally zero other red flags, especially none outside of your control, maybe. Urgh, I am so sorry, I know how this issue can really fuck women up but as I say I can't help what I like, but I am super realistic about what is possible and what is not. Urgh urgh."
Suggestions for an appropriate response would be very much appreciated.