I am in a similar boat. I want to and have started de-Apple’ing my digital life but I worry that it will add a ton of friction with the GF since we have a bunch of shared lists, notes, reminders, calendars etc in iCloud.
I also want to use Signal with her but there is no way she will want to use another messenger app just to chat with me when she uses Messages/iMessage with everyone else.
Apple and iCloud make it so easy we are almost trapped, more so when you have a family or partner using it too.
Not sure what I am going to do yet.