I have had experience of being dumped and leaving things three months before contacting a ;long time ago ,my ex (girlfriend) after a few days of texting we did in fact arrange what she called a first date. It never happened in the end because after more thought I decided at the time it was better to move forward with my life.
I guess its a case of (if you want to) opening the door to them after all the initial negativity has worn off , they may respond they may not but sometimes its worth finding out.
By coincidence its happened again to me this time after I really though i’d found the one as they say , its been a difficult month where I have kept the lines of communication open but its been soul destroying at times , now its time to start NC .. as much for myself as anything else , Perhaps she will miss me perhaps not , I think if the love true;y was deep enough and there was no adverse behaviour in the relationship there is always a chance but either way NC although hard is the best medicine for me and on the bad days I will say to myself ‘if I loved her that much I loved her enough to set her free’ .. a free songbird can fly back if it wants to.