Long Distance Thoughts

I have a very pretty and kind of nerdy gf, we are in a long distance from long time ago. Separated by two diff. Countries.
Overall my gf looks very innocent but hot on bed( i knew when we met first). She got opportunity to go onsite(Capetown) from her office before our first real meet, where she spent almost 8-9 months. Since we are loyal to each other we never had sex with others in real but she started to develop sexual fantasies for others while have phone sex with me.. she likes to imagine her colleagues and past college friend with her naked and fucking kissing licking her body that confuses me if she was fucked by any of her colleague. I dont know but she tells me that she cant imagine someone to touch her in real.. i don't know what's the truth if she slept with someone other than me in this relationship.