Part of the reason why I am losing weight, is for my husband. He married a petite woman and I think it is not fair that I have gotten this big. I was his "type" when I married him; if he had wanted to marry a chunky girl he could have chosen someone else.... I am sure I get all sorts of crap for my reasons, ugh.
My husband does love me for me, and has never complained about my fuller figure, but I know that deep down he would find me more attractive if I was smaller.
I think there is absolutely nothing wrong doing part of your weight loss for someone else.