Mine was a decade ago... he left around this time then, in fact... but a decade is so long sometimes I barely can believe I did have anyone, especially as it was one of the very few times I was somewhat lucky in life (but not so much if it lasted 7 months... still, better than nothing?)
Life was so much easier in that little time, too... I so often feel so overwhelmed alone... couldn't even continue on to uni after he left (was already going to quit college before his entering my life made it so much easier I finished it, but then exited soon after college finished, as if it was some assigned mission )
I've been... rotting alone for a whole decade... my sister was so much luckier, it seems, hers lasting over a decade despite him being even older than me (could be her child being the glue, but it doesn't seem to be an especially dysfunctional relationship to me... unlike every single one I've ever experienced... sadly even my only romantic one kind of was, as he was on the spectrum too and his outlet when frustrated, which seemed to happen often and without much reason it seemed to me, was to bang his head... other than that, didn't talk to me much, which I suppose is an ingredient to a relationship's dissolution... he was the one who wanted to leave...)