My girlfriend made a comment...?

[RussianMonk]

I'm very upset because my girlfriend is still friends with her ex-boyfriend on Facebook. She claims that they have nothing going on between them and she made a very hurtful comment: "I'm sorry this is going to sound wrong, and every guy was hurt by this, but Alex knows me better than you probably ever will." Fair enough, they've been together longer than we have. Her and Alex for two years, me and her for one. However I tried to explain that just by the simple fact of being FRIENDS with someone on Facebook is a gateway to other things, such as a relationship. I even asked her "How do you think WE got together? Because I added you on Facebook in the first place". I also do not like the fact that she made me remove ALL of my ex-girlfriends from my friends' list while she is still friends with hers.

Also, we are in a long-distance relationship, I'm away at a four-year university. She doesn't have a job, not going to school either. That type of environment puts a lot of stress on us, trust wise.

Should I suck it up and let it be? Or should I somehow approach this argument from a different point of view?

Thank you