You haven't said how long you've been in this relationship with your bf, but if he's starting to notice, then it probably means it's time to take baby steps and let him know what's going on with you. I've been in the same place you have, but not so worried that I'd 'test' the man (or woman friend for that matter) but just that I would do something inadvertantly to muck it up. It's an unfortunate place to find yourself, and doesn't do anything to help self-esteem issues.

I agree whole heartedly with red_panda...start small, and with the easier to grasp anxiety issues...nearly everyone has been anxious at one time or another in their life so it should be easy for him to relate to. And I think, the sharing will reassure him you're not getting bored with him, and that the distance he perceives is about anxiety, not your desire to end things.

Men get anxious about that too, after all. Even 'nons'

Take care