Re: ok...I have a few questions
I don't think your ex is a lesbian. After all, she did like you. And she said she was straight. Why would she lie? As far as her affections with girls, it could be that she just needs the attention. Or she could be bi. But, it is so trendy these days for girls to act bi. Lots of girls just act like it for the attention. So you just never know... To me, it sounds like your ex just really needs and craves and wants attention.
And yes, girls do look at a guy's body. Most women prefer some muscles, but every girl is different. Some girls prefer a guy to have a slimmer body, while I personally prefer some meat on the bones -- like, even if he has a some chub. I personally like to feel small against a bigger guy. Some girls focus more of their attention on a guy's personality and attitude more than their appearance. It is different for every one. And, it changes as you get older.
Yes, I've had guy friends who I thought were hot and I only saw them as a friend. It could be that he just wasn't my type, his personality didn't click with mine, or maybe I was already in a relationship, or maybe he wasn't interested in me. Or maybe I liked the friendship more than I would like a physical relationship. There are lots of reasons...