is my fiance cheating??

cindy

the other day I was going through my fiances phone and seen a number with a guys name on it next to it, it said(work)

...I skimmed through his texts and everything seemed normal. mentioned about hanging out Saturday with family...but at the very top the first messaged ever sent was from that guy and it read ... I miss you :,( ......

my question is is he cheating g on me?.... or is it normal of a guy friend from "work" to tell him he misses him? .. I called today private but couldn't seem to tell the voice whether it was guy or girl since I was nervous... I need help advice..I don't wanna mess anything up between us...help?! please....