Am I (20M) making a mistake?

Me (20M) and my girlfriend (20F), do ldr, I love her so very much don't get me wrong I'm still attracted to her, head over heels for all the little silly shit she does, but right now there was this one girl (20F) I made eye contact a LOT within the lab I'm working right now, she struck up a conversation yesterday a bit before I left and we've talked here and then since, and now we were just talking for some 10 minutes where she asked if I was free to show her around the campus, she's never been here before and I agreed with it. I don't know if I want to become friends with her or if I'm unintentionally leading her on, please help me out here I can give more information if you've got any questions

Tldr: I'm in a ldr with my girlfriend 20F, I have been making eye contact with this one girl 20F in my lab who I agreed to show around