No attraction to other people at all?

I know, I'm probably overthinking this stuff, but it just bothers me that I can't find any other guy attractive and it just makes me feel weird. I used to find other celebrities appealing, but when I started dating him, my "attraction" towards them just stopped out of nowhere and I don't know why. I feel broken for some reason, it's just sometimes people freak out a little and sometimes just plain out tell me "you're weird" when I don't think a certain someone or celebrity is hot, and it just puts me in an awkward situation... 

Is this normal to feel this way?? To ONLY find your S/O attractive? Sorry again if I'm overreacting, just not sure how to entirely feel about this...