Please help.

Hi I'm 20 and I currently suffer from anxiety and stress. lets just say it comes very easy. My girlfriend and I have been going out for a year and a few months (highschool sweethearts). so it's pretty serious (for me anyway). I have just found out that about a month ago my girlfriend was telling her friend about her co-worker - that she feels crazy around him but knows it's bad to feel that way and I can assume that she has had sexual thoughts about him as well. my girlfriend said that she doubts anything would ever happen i.e. he has a girlfriend and he does certain things she hates blah blah blah.. but this completely flew over my head... so now I'm flipping out.. lately we've been less frequent with intimacy i.e. sex and passionate kissing. She tells me that she loves me and tells me she wants to be with me for forever. we are never really apart from each other, excpet for work. She hates cheating/cheaters since she has been cheated on herself. Is it normal for Girlfriends/Partners to think of 'other people' in that way but not act on it? could it just be me overthinking things? I just hope that she isn't putting up a facade being with me.. this girl is my everything (literally) If she wanted to leave me, she would have done it already, right? or could she just be waiting for something better... please, I could really use some advice... I'm freaking out.

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