<human>: Give me a shortened version of the text

My finace talks to one guy who's got a huge crush on her,  I don't want her to!  I'm 18 and in a long distance relationship with the woman (19) I love and soon-to-be-wife.  We've been together for over a year, one year has been spent across the country.  We are both very trustworthy of each other and do as much as we can to keep communication tight :)  We skype every other day and talk at least once a day, not because it's a routine but because we have a fun time together.  She's my best friend and I'm her's.  

Now, besides our relationship life, we have lives of our own and jobs/educations that need to be maintained.  I'm not the jealous type, but I don't appreciate when people try to flirt with my fiance right on facebook.  I feel like that's a slap in the face.  Gratefully, she doesn't flirt back.  It's just something that bothers me because these guys clearly don't care about her relationship and I'm stuck across the country and I've told her that I wouldn't be comfortable with you hanging out with him.  And she's agreed with me, time and time again.  Yet, ill see her posting on facebook saying "hey, when are we gonna hang out again? " on that guys wall.  What am I suppose to say or feel when I read something like that?  After we've gone over it before. I don't want to seem like some facebook nazi watching her every post.  I'm also not the type of guy thats controlling.  So I can't say, "You will NOT talk or see that person ever again!".  

I don't think she'll every cheat on me if she did hang out with said prick because of our level of trust we share.  I'm just worried that this guy will do something.  It's the only guy friend I have a problem with because he doesn't seem afraid to challenge our relationship.  I just don't know why she would encourage it... I guess I've never asked her :/  Any advice or ways I could bring this up in a conversation with her?
<bot>: Other guy trying to steal my fiance, flirts on facebook, she encourages hanging out with him even after I've expressed to her how I feel, makes me really uncomfortable... What do?