Girlfriend issues

Basically my girlfriend is usually a massive sexaholic, she moved in with me around over a month ago (we’ve been together nearly 2 years) and now she doesn’t have ‘the energy’ for sex as much as usual. And if she is then it’s all about her. I’m not usually bothered about not getting any as I’m usually a giver more but I’m starting to notice change. And she’s more loving, for the last 4 nights she’s got me to spoon her and squeezed my arms tight around her and saying ‘I love you, I love you so much’ ..... I don’t know if I’m overreacting but i feel like guilt is in the mix or something!? Just need reassurance here on what these signs could be. It’s just the way she says it makes me feel worried 😂