Am I a stalker? Help!!?

[Jessie]

This could be considered stalking if you see it this way, however its sounds like you are reminiscing about fond memories dew to something like: what you have done or what you've seen or experienced for such along time, that you cannot forget or let go off. From what you have said, it has given me the sense of possessiveness / belonging or can been seen as attention which is not a bad thing in your case and the gf's pictures is either jelousy or curiosity or both depends on how you see it. Hope ive been some sort of help