Oh sure, long lasting interests are easy. I love to make art, write, read, listen to music, watch movies, and play video games. The thing is most of my obsessions also fall into those categories. It's weird because the crap I obsess over isn't really anything that could be a long-term interest or hobby (like shopping for a certain piece of clothing or finding a celebrity attractive), whereas my actual interests stay with me. It's really weird.
Thankfully I am not at a point where my obsessions result in me spending large sums of money (like buying expensive memorabilia). I may spend some, but not enough to make me go broke. And if the item in question is something I absolutely will never like or use after the obsession passes, I will try and sell it. Usually, though, it's something I will like/use for at least a little while.
And the things I obsess over don't end up being totally forgotten once the "honeymoon" period ends. For example, if I'm looking for a certain style shirt for a few weeks and don't find it, I will still like that style once I quit searching. I just won't be dedicating so much effort to finding it. Or if I've got an actor on my mind for a while and the obsession passes, I will still find him/her to be a great actor. I just won't be daydreaming about them all the time.
When it's the worst is when it involves a person whom I actually interact with. I not only get fleeting obsessions with inanimate or unattainable people, but I get fleeting crushes on people sometimes. Nothing that is "true love" by any stretch (I'm happy with my current partner) and nothing I would pursue even if I was single...just very awkward if, say, I find a classmate attractive and they sit next to me and I begin to fidget.
I'm experiencing that with someone in my class right now (thankfully class is only in session every few months). He's not even my type - he's 10 years older than me and has totally different interests than me. Yet I find him attractive. I know next to nothing about him. My "fleeting" crushes tend to last considerably longer than my object obsessions, which I hate. I'm glad I can at least hide the human obsessions well should I end up being in contact with the person in question.
I just wonder...WHY do I do this stuff? It makes no sense!