<human>: Could you distill the essence of the text into 1-3 sentences?

So to start things, I was in one big relationship for almost all of my time in High School and thus, didn't learn a shit load of lessons about relationships, other than how to be in a long term relationship. The beginning of relationships confuse me and I've never had to break up with someone, only ever had my heart broken. 

My GF is about 300 miles away for the summer and everything has been seemingly fine but some of her friends that I still talk to have been saying worrying things, like that she has been face timing with someone that she used to "casually date" and that she doesn't stop him from hitting on her. She views people hitting on her as harmless and that she wont cheat on me. She mentioned that he texted her but not the face time and knows that stuff bothers me. In addition to this they have been hinting to me that they think our relationship is much more physical than it is emotional and that she doesn't really love me, even though she tell me most days. I asked her "If I wanted to stop having sex when you get back what would you do?" she responded with, "you can stop having sex, I won't, I would just stop having sex with you." Is this break up worthy? I wan't to be with someone who I can really love...
<bot>: Gf's friends say that she doesn't love me and that she only wants to be with me for sex. What should i do?