It's common to block friends' access to your friends list. I've done it. Who I'm connected to is private to me. I'm also not interested in the numbers game so I bow out. He may have blocked this to prevent potential issues. You read it as him being secretive. He corrected it again for you so maybe try not to over-read this one.

The trouble with dishonesty is that when one tells a truth, we don't find certainty in it. Your husband has dug a hole for himself and although he's sick of these questions, it's truly a part of the package when we're dishonest.

The bottom line here is, you don't trust him. Damage is done. Let go of the what-ifs and the snooping and focus on an exit plan. It's hard, I know. You can't change him or your feelings about him. If this was strictly due to your previous relationship issues, then this would be all on you. These feelings though, were brought on by HIS actions and you need to keep reminding yourself that. Sorry for my direct approach.