It looks to me like I'm getting targeted by a thinking player at some tables ($10NL). This player will generally be one to three seats to my left, will call whenever I open the pot (whether he's IP or OOP - my typical preflop opening from HJ to button is 4x BB), will call my cbet on the flop, and then will raise or c/r my turn bet. His stats will generally be around 20/8/2, and he will have one of the larger stacks on the table. My stats are generally 15/9/2, though my stats from the HJ to the button are much laggier.
Questions -
1. At $10NL, I'm not expecting this level of thinking - am I just seeing monsters under the bed, or is this a basic strategy at $10NL?
2. If I'm not being paranoid, what in my playing style is leading him to think I'm a good target for this strategy?
3. Does this player really have a hand (variation of "monsters under the bed" question)? Should I be trying to 3bet him on the turn with air at some point? He'll stop doing this if I show down a monster once or twice, or if I 3bet the turn - but I've only been 3betting the turn with my monsters.