It's funny. Because we had a chat this morning. It was slightly heated. Then I reminded her that I am not my mental health I am her girlfriend who suffers with it, in the same way that she had a cold last week but she was still my partner not a cold. I told her I know that things are frustrating with my mental health not being good right now, but that sex is still important. She agrees with me but she said I need to stop basing wether we have sex on whether she finds me attractive or not. She said that stress comes out for me in my moods, stress comes out for her by being tired or just wanting a bit of space. She said sometimes she feels like she's taking advantage of me if she knows that my mental health isn't good, and that sometimes when I've dragged a situation on its not an attractive quality.
She also says she wants sex with her girlfriend, and that recently I've not been my usual self and it feels like she's living with someone else.
I feel like I can understand both my side and hers.
I know she loves me, she shows it in other ways all of the time. I've just made a rule that I won't mention sex unless it hasn't happened at the weekend.

Funnily enough, we've been intimate after that chat.