Hm.... I think its OCD. Wow, i never realized this and as i read the comments I really didnt know the answer but now that i think of it im sure its OCD. How am i sure? Well i have OCD, or atleast I think i do.. i haven't been diagnosed but ive researched and i can surely relate. Anyways, I realized I too have an obsession with people. Usually girls.. When i see a gorgeous girl I become obsessed. I dont love them I don't hate them. I just want to look at their pictures, know what they're doing and thinking.
I know its not just obsession because i think with obsession you WANT to i guess "stalk" the person, but with OCD it feels like its something you have to do.
Most of the time i dont really WANT to obsess with them. I just do it apathetically... which means it is my OCD.. not just an obsession.
Since this guy loves his girlfriend im sure he doesnt want to continue this obsession, he probably just does it because its a ritual to follow, somethin he just needs to do.

hope i wasnt too confusing....