<human>: Can you condense the text into a few key points?

I feel uncomfortable and am not quite sure what to do.  My last two relationships I've been cheated on, and I'm feeling anxiety with this situation.  He lives about a 7 hour drive away and is married.  They flirted quite a bit last summer both through text and in person (we weren't together back then).  She tells me they didn't have sex, even though she was alone on his boat overnight, and she isn't physically attracted to him.  However my intuition is going crazy.  I don't think they are conversing in an inappropriate way (sexting etc.) But I'm struggling with the relationship given my past.  Is it truly possible for a woman to have a platonic relationship with a guy?  Or is this a set-up for a convenient affair between the two of them?    We've been together for 9 months.
<bot>: current girlfriend has a guy friend she has a history with and texts regularly, am I just being overly sensitive given my past.