Im 18m and in a relationship with 18f. We've been dating for over a year now, and it's been amazing, i love her, and she loves me. At the beginning of our relationship, she introduced me to her friends, and we all got along. She then told me that one of her friends couldn't meet us, so i had to meet her at another time. A few weeks go by, and my gf asks me if I'd like to go out and meet her other friend, and ofc i said sure. Once we got there, my eyes were met by the most beautiful little red head I've ever seen in my life. The way she looked at me made my stomach feel funny, and since that moment, I've been wanting her. I love my gf so much, and i would never cheat on her. I just needed to get this off my chest and possibly get some advice on what to do.

(Her friend has also outwardly said she would gladly sleep with me and that im very attractive. This only worsened my feelings for her)