I was quite young but had a horrible experience
Met a guy abroad, had a fling, developed a LDR for 6 months and then he moved down to London.
He was here for about a year, he had a job and a flat share. We were planning to get a place together, had a holiday booked and were very much in love.
He rang me one day at work (I'd left him just a few hours prior) and he was on the train 'home' [up North] He'd jacked in his job, left my stuff with his flatmate and that was it. He was sorry, it wasn't "me", ha hated London. He then rang off and never switched his mobile on again.
To say I was bereft was an understatement. Yes I was young and yes we hadn't been together that long BUT it was the nature of the abandonment that really got to me and of course the fact I had lots of unanswered questions and had no "closure" - I loathe that word but it's the only way to describe it.
I had his parents number and address and rang a few times in the weeks that followed but it soon became clear I was not going to hear from this man again. This was very early 00's so predated most social media. Short of turning up on hos doortstep - which I contemplated many times - I knew I had to get through it without any answers.
I ended up in a terrible way to be honest, went out drinking A LOT (I was early 20's so it was easy to facilitate going out with friends) and fell into a FWB type relationship that resulted in a pregnancy I didn't continue with.
I actually then ended up in classic rebound relationship that was a disaster and ended up causing a lot of hurt the the bloke over many years.
All in all it took a very long time to get over and even now 13 years down the line I still think I was treated disgustingly.