If your gut tells you something is wrong, then likely there is something going on. You followed your instincts, and you were right. Don't feel even a little bit worried that you asked him anything! If someone is dodging questions, or uses the excuse that you are "insecure" they are full of BS and trying to hide something. Any question asked should be answered, any proof sought should be given, any story validated. My wife can follow me, check my emails, my phone records, my laptop...any damn thing she wants. And if she is insecure about something and wants proof, I have zero problem giving it to her. Anything less would mean that I'm hiding something. The real issue I would need to deal with is why she would get insecure in the first place.