No its not weird. Actually, I had that happen to me one time with a guy, but guess what? We are still together!! I'm older now and it happened when i was 16. i believed that i felt that way because I've never done it before. I mean you did that at 15? So it could be that. Do you still talk? Are you talking to other women?? Do you feel attracted to another women? Have you tried holding her hand or anything in a while? Maybe YOU need to spark the relationship up. Did you ask for the oral or did she? If so you did, maybe you pushed your limits? Did things too fast? But if she doesn't know this, tell her for sure and explain why. It could hurt her, but you need to tell her why. You can't hide anything from your girlfriend. Especially if its been a year! it had to have worked because you didn't hide things!! Maybe you two can figure it out. If not, best thing to do is break up, she could have a guy love her physically and intimately then one who doesn't and be happier. But things could always work out.
How I got over it was i told my boyfriend and he was confused at first. but its been a while and i got over the feeling and we worked things out. Maybe you need to be more physical to feel intimacy? I know when we did oral again we felt it. also before we tried to snuggle and cuddle and do all that to see if i could get any feeling. BUT i talked to him and if you don't then you WON'T get the feeling back.
So answer my questions, maybe I can help more!!