My girlfriend says she loves me but tells me that she loves someone else too
My relationship is about 4 years old. We were kind of living in together. As of lately, I was very busy doing my Thesis in Architecture that I couldn't give my time to my girlfriend though we shared the same room. Meanwhile, she went out to play badminton regularly. Very unfortunately for me, she fell for a junior of about 4 years with whom she used to play badminton. We talked about it. I told her that we could end the relationship very amicably if she loved him. But she says she doesn't want to break up as she loves me and saw a lot of dreams with me in future and she is not very sure if its love with that guy. She terms it "Teenage love" with that guy, while we are in our mid twenty's. At the same time, she says she cannot stop texting or calling or meeting him. We are in good talking terms and she neither wants to break-up with me nor get committed to the other guy. I am very much in a devastated situation where I know that she loves someone else. Please give me your valuable opinions on what I should do.