First off, welcome to Psych Central.

I did read all that; it was actually extremely gripping. I wish I knew what to say! Personally, I'd most definitely be worried, but we're only getting one side of the story, you see, so I could be missing something. I don't know this guy nor his history, so I can't really comment on that, either. Has he cheated before? Does he have a habit of being dishonest? It might well be that while they haven't done anything wrong, they may be getting closer and closer and closer... that would definitely make me paranoid.

His inability to... y'know... thingy, doesn't necessarily mean anything, but it could've been guilt and/or anxiety, or maybe he was just tired and it was nothing... the body works in weird ways, for women, too! xD

How long have you two been together?

More to the point, why is that someone not you, his girlfriend? I realise some things are best left for others, and that it's no crime to talk to other people, but going to another woman to talk about stuff when he could just go to you, presuming you are understanding about whatever it is he wants to talk about, seems questionable, in my eyes.

I can certainly understand your suspicions, but then I'm pretty cynical.