What exactly feels funny? Is it that you aren't used to him being around and spending more quality time together? Is it that he is acting silly and that concerns you because it is different? Has he done something to make you think OW is back? Is it the stress of everything going on in your life?
I think you should talk to IC about this before you talk to him to make sure that you aren't confusing how you are feeling with maybe being scared about your wall coming down. You had to make a wall to get through the last few years, and now that things are going better and H is actually sticking to his part of the bargain...it can feel strange and make you wonder.
At the same time, maybe you are picking up on something else. I would just hate to see the good progress get stopped. He has said OW is out of the picture. He gave you his passwords. He invited you to Europe. He seems to really be trying so why would he mess that up again? If you do talk to him, make sure you write down and look over it many times what you want to say to make sure you aren't being accusatory or abrassive, but truly explaining your feelings.
Have a good day!
Me29 S3 H left 4/1/09 I file 8/2/10 Divorce final 5/17/11 1st http://www.tinyurl.com/25lhu52 2nd http://www.tinyurl.com/2c35ueg 3rd http://www.tinyurl.com/322yk89