Do talk to the officers before you leave to let them know why, if you'd like, but other than that I don't think you have any other obligations, social or actual. And it's in your right to completely retcon your time there and write something else to go there instead, as well, if you want- doesn't even depend on the severity of whatever reason you had for leaving, it's your character and you don't have to carry around every FC they've been in if you don't want to. Unless the FC is really, really big, or you RP with people who are friends of the FC but not in the FC, chances are their remained inclusion of your character in their story-thus-far, if they choose to do that, won't bleed into or interfere with other RP you find in the future.
I speak a little from experience here. I've retconned a character's existence in a guild before from her current and backstory and it ended up not affecting much, if any of my RP afterwards. I retconned for personal reasons related to the circumstances behind my leaving in the first place. What was removed ended up only being a small would-have-been chapter of her story, anyway, as I continued to RP with her with better groups. The one or two people who remembered my character's time with the first group were completely understanding of the retcon and went with her new story.
My example of my personal leaving of an RP group is more extreme, so for another example, people leave my FC occasionally if they're just not a good fit, or if they don't have time for the game anymore, or if they have found another group they'd rather RP with, and that's fine and dandy. They say their goodbyes and head on their way and there's no drama. I'm not sure all FCs are as chill but I'd be willing to bet most of them are.
It's your character, your time and your money to do what you want with, but good on you for wanting to leave in the least disruptive way possible! Here I suggest the less is more approach. Just be polite as you leave and move on.
I speak a little from experience here. I've retconned a character's existence in a guild before from her current and backstory and it ended up not affecting much, if any of my RP afterwards. I retconned for personal reasons related to the circumstances behind my leaving in the first place. What was removed ended up only being a small would-have-been chapter of her story, anyway, as I continued to RP with her with better groups. The one or two people who remembered my character's time with the first group were completely understanding of the retcon and went with her new story.
My example of my personal leaving of an RP group is more extreme, so for another example, people leave my FC occasionally if they're just not a good fit, or if they don't have time for the game anymore, or if they have found another group they'd rather RP with, and that's fine and dandy. They say their goodbyes and head on their way and there's no drama. I'm not sure all FCs are as chill but I'd be willing to bet most of them are.
It's your character, your time and your money to do what you want with, but good on you for wanting to leave in the least disruptive way possible! Here I suggest the less is more approach. Just be polite as you leave and move on.