What's in it for them?
And by stalk, I mean in the sense that they are hidden from you. What are they gaining from it by remaining in the shadows, do they get some sort of voyeuristic thrill?
I'm asking this because the last time he D & D'd me, last spring (hmm, now that I think about it, it always happens right before summer, and he crawls back when summer is over) I started a blog of my own. I am in a grad program for writing and just needed something to put my material out there. A lot of it was personal. I'm a pretty open, blunt person, and I don't really have an issue with sharing the muddier parts of myself. So in that way, it was a pretty revealing blog to showcase my writing style.
I had set up web analytics because I was offered a free trial through my web host. I could see all the details of every visitor- what time, their ip address, location, how long they spent on each page, each click they made, what browser they were using... EVERYTHING! A few weeks in I started to notice one daily (sometimes twice a day) visitor. I was in a different state from my NX, but it was in his state, his mac browser, seemed to correspond with his "up all night" schedule. Basically, I knew it was him all along. A month in, this same user started making comments under my posts. Mostly neutral, some were actually sweet, others were hinting at things and sounded stalkerish. It got to the point where I shut the blog down and called him out on it, and of course he ignored me. All he said was "Obviously you're not an easy person to forget" and then he ignored me for about 2 months after.
I was still caught up in his spell back then and swiftly took him back when he came around, because I interpreted that behavior as him caring. But now I know it couldn't have been... there had to be something in it for him, but if he thought he was completely anonymous then what did he get out of it? Why bother? I only ask because I want to fully understand the narc's intentions to avoid rationalizing anything to myself in the future.