Maybe its something as simple as he loves you and feels comfortable and relaxed enough to start showing it? I know it took DP a huge amount of time to show affection as he didnt want to be rejected. Then when he knew I was around for the long haul he upped the anty (sp?).
Its hard as you dont want to tell him to stop as he is expressing his emotions but if he did you may be sad it stopped?
I remember aggggges ago reading a thread of yours....must of be a few maybe more months ago where you were upset that your DP never told you he loved you/were pretty/sexy, etc. Cant remember the context but for some reason its stuck in the recesses
If he doesnt think he is being weird and there is nothing for you to feel suspicious about maybe all that it is, is that he loves you.