<human>: Can you succinctly summarize the text in 1-3 sentences?

Been with my gf for 2 and a half years and in that time her weight has creeped up and up and it got to a point where I wasnt starting sex as often because I wasnt attracted to her as much as I use to be. She doesnt have a great deal of confidence with her appearance so this is why I held of saying anything - if she didnt ask, I wouldnt have said.

In november, she asked why I havent been starting sex and I was honest, I said I still love you and want to be with you but you have gradually put on weight and I am not as attracted to you as much as I use to be. 

This started world war III.

Her response was "body image shouldnt come in to it", "I would still love you if you got fat" and "if you love someone, you shouldnt care if they put on weight" and threatened to end it. 

I dont think that reaction is particularly fair. Especially as I try hard to look as good as I can for her. Attraction is primarily the reason we started speaking in the first place, but obviously not the only thing and in any relationship, being attracted to your partner is important.

Since we had this talk in November she has not tried in the slightest to lose any weight.

I need a second opinion

Am I being unfair or is she being unreasonable?
<bot>: My gf has put on weight, I told her after she asked why I dont start sex as much, she threatens to split up basically saying if you love someone it doesnt matter how they look.