Only a few of us (Thank GOD) have had to consider, truly, those concerns.

You, however, seem to be having irrational fears. It might be better to try and work through the WHY you fear this T abandoning you, rather than work on a way to try and make sure you know if/when it should occur (which, really, is a never-ending, no closure endeavor imo.)

Maybe you are using this "fear" unconsciously to prevent yourself from 1) working on what your T wants you to or 2) push the T away from you so you don't have to trust T because they might die anyway?

IDK.

We are all dying...some of us just know it's sooner rather than later. Work on living as best you can for now.