I think some levels of ADD/ADHD and OCD symptoms are relatively normal as long as the person can function normally. I had a compulsive-checking-everything-before-leaving episode some years ago. I would check the appliances, the lights, the water taps and the locks multiple times every time I had to leave the house. I thought it was because I was too distracted to remember that everything was in order (thus, ADD symptom). It was annoying.

And as CANDC said, there are different things that can influence the behavior. He might just have a lot on his mind and that is why he is misplacing things.

What do you mean by 'new primary boyfriend'?