How do I feel about girl?! I'm confused!

Hi everyone - this isn't a massive problem compared to some on here and I'm not totally stressing over it but your perspectives would be greatly appreciated! I'm a male, early 30's and have gf. I play in a band and we have female singer, the rest guys. She is dating another band member of the band. My issue is that when we have rehearsals or a gig, I find I can't stop thinking about her. I got to sleep thinking about her and wake up thinking about her. It's not like this when I haven't seen her as much. It's like she gets into my head! This will sound crazy but even when I pass somebody in the store and they have the same perfume as her I kinda like it cos it reminds me of her! What's going on guys?!

How do you feel about your girlfriend? Maybe you should have her come along to some rehearsals and gigs to see if you then focus on your gf instead of the band member?