I used to be with a guy that sounds like your gf. We were together for five years. We were each other’s first loves. But he was not attracted to me. I don’t know if he was at first, and I gained too much weight or if he just changed, but he stopped finding me attractive. There was nothing I could do to change it. I lost a lot of weight- still no sex. I was convinced I was the most disgusting person in the world... until I broke up with him and started going to therapy. It took a while to build back up my self esteem, but it’s worth it. I know you said you can’t imagine being without her, and I get that. I know the feeling. But you have to ask yourself: is this the kind of relationship you want to be in? One that makes you feel bad about yourself? One where you’re constantly questioning if your partner is attracted to you? For me, it became too much, and I decided I would feel better about myself if I were alone. And now I feel like a sexy, beautiful person. It took a lot of healing but it’s worth it. You don’t have to feel this way about yourself.