The thing is, it doesn't necessarily help if you do find out the reason!
I work overseas. It's a bit like being permanently at Uni, in that there's a batch of new faces every year, you work, live & socialise in each other's pockets, then after a couple of years people move on & become vague presences on social media.
A lot of the time you have 'friends for a reason' (networking) & 'friends for a season' (you don't make much if any effort to keep in touch, but then 5 years later you both wash up in the same country, & happily prop up a bar & pick up where you left off).
The other thing is there are the drama llama types, who lurch from one Eastenders style friendship crisis to the next, & then there's the wiser heads who stay cheerfully low key matey with everyone because you never know who will turn out to be in the ear of your next boss, etc.
Anyway, so 'Sarah' was definitely the drama llama type. But she was great fun, could be super kind & supportive, & I thought we were pretty close.
A year or so after she left, I noticed I'd been blocked on everything. Ouch.
But oh well, she'd just had an amazing promotion...maybe she was just having a cull in case awkward drunken party pictures from the past surfaced?! Except she hadn't blocked anyone else, & I quickly heard that she was calling me all the names under the sun to anyone who'd listen.
I was totally baffled.
Then, a couple of years later, I ran into her in a bar on holiday, somewhere totally random, & she weaved her way over & jabbed her finger in my face whilst slurring at me that I was an evil bitch for telling everyone she'd been sleeping with her cleaner.
I hadn't even known about it, much less gossiped about it
. But even if I'd been able to convince her of that, there didn't seem much point trying to salvage that particular friendship...