bf rejects sex

I was a virgin before dating my bf. He wasn't and I'm ok with that cuz I love him dearly, my problem is he says about this sex he's had with other women and sometimes he won't have sex with me for over a week. And I've tried to get him to do it twice today and nothing. First he had an excuse how we were busy this morning and just now he just told me to stop and I did but it hurts and kills me. I just feel like I'm not good enough. Does anyone else go through this?