just a side note ... I did not perceive the original post as in alters .....dissociating.... into other parts because of the word splitting yes but also because I have gone through what the poster stated. I even took out the word splitting when I read the post a few times and went more on the posters own words that they felt the alter was (quoting the words by poster) "with me"

with DID when a person perceives their alter in words like "with me", "together" "merged" in my location that points to alters becoming one with the one writing the post.

when alters dissociate into more alters the same elements need to be there for, for example when the body born dissociated into more alters.... in my location that means going through extreme trauma. then when it happens no one feels it happening because in my location dissociation is feeling numb, feeling spaced out, and feeling disconnected (as in not all there, not feeling connected to ones limbs and body)

since the orginal poster did not say they were undergoing an extreme trauam, did not say they felt numb, spaced out or a disconnection from their body parts, quite the opposite.. the poster stated they felt safe, the treatment provider guided the alter to feeling and being in a safe place. there was nothing traumatic going on here.

this lead me back to what I experienced when going through the alters integrating/ becoming one with me or as some locations call it merging together,

Trailrunner what you feel as a remnant left behind in me was a unresolved issue/ memory, my alters felt ready to merge together with me but some left behind some memories and problems that they had been dealing with for me that they felt I could now deal with on my own. some were by normal any mental disorder term would be called a repressed memory and others were just issues that took time for me to learn how to do.

give it some time now that the alter is in your words "with you" everything you need is there for you to work on what ever is left behind be it a common every day memory, or a repressed memory or an issue of some kind that the alter felt you could handle now so was leaving it behind.

and of course my standard continue working with your treatment provider, they are one ones working with you and your alters so they are in the best position to help you with dealing with what ever buried memories, emotions, issues that they left behind as they merge together with you.