A lonely bed

I’ve never been with someone that has insomnia until I got with my girlfriend(puddin) she has told me she has insomnia and I just blew it off at the time. At first it was all good when we would go to bed after awhile I’d wake up to use the bathroom and she wouldn’t be in bed with me and it would make me mad at her for not being in bed with me so this has went for over a year and it still hurts when she’s not next to me. I’ve pushed her away from me (she says complaining) about not coming to bed with me. It’s has puts some distance between us. I’ve done some reading on insomnia but haven’t understood it just yet! We love each other but we resent one another! How can we fix this? Emotionally hurt