I love my girlfriend but can't stop thinking about another woman?

My girlfriend (26) and I (24) have been together a little over 6 months. We both have full time 9-6 weekly schedules and we do our best to make time (gym twice a week together) and spending weekends together. Our sex life has slowed down due to our busy schedules but it's still great when it happens.

Currently I am taking a college course to brush up my business skills and there's this girl who just makes my heart beat everytime I see her. Sometimes we'll lock eyes but we won't engage in conversation since she sits across the room. I am so tempted to talk to her but I know it's not right. Sometimes just seeing her is the best part of the school day I look forward to (even though I don't know anything about her.)

I love my girlfriend and I KNOW this is wrong. There are plenty of cute girls but this one in particular I can't stop thinking about and it's affecting me (getting distracted--less interested in what my girlfriend did that day, etc).

Ladies, I need advice please. What do I do? Do I tell my current girlfriend about this (which could lead to a awkward breakup-ish senario from her) or just talk to this girl as friends to get a better read?

Thank you for your replies.
I love my girlfriend but can't stop thinking about another woman?
Post Opinion