NEAR GND COLLISION WHEN A GA ACFT LANDS OFF OF AN ILS TO RWY 36 AND A SMALL BIZJET ATTEMPTS A TKOF ON RWY 18 AT ZZZ; US.

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SUBJECT ACFT HAD PREVIOUSLY DECLARED AN EMER AND WAS DIVERTING TO ZZZ. CTR RELEASED A SMALL JET IFR AT ZZZ; BUT WARNED THEM THAT A GA WAS ON ILS 36. JET ENTERED RWY AND BEGAN TKOF ROLL ON RWY 18 (TOWARD ME!) AS I WAS LNDG. JET ABORTED TKOF AND WE PASSED EACH OTHER IN RWY. I NOTICED MOVEMENT AT THE FAR END OF THE RWY. AS I WAS ENTERING MY FLARE; I SAID IN DISBELIEF; 'THE JET IS DEPARTING!' CTR GOT A 'LITTLE' CONCERNED AND SAID; 'YOU GUYS ARE SUPPOSED TO BE TALKING ON 122.7.' THE RWY WAS WIDE ENOUGH THAT THE JET AND THE GA ACFT WERE ABLE TO SCOOT OVER TO THEIR RESPECTIVE R-HAND SIDES AND PASS 'COMFORTABLY' PAST EACH OTHER AT 30-40 KTS EACH. REFLECTING BACK AGAIN; I REALIZE THAT I MADE A LONG STRING OF ERRORS THAT CULMINATED IN NEAR DISASTER. THERE WAS CLRLY A POINT SOMEWHERE IN THIS SEQUENCE WHERE I SHOULD HAVE BEEN ABLE TO SUCCESSFULLY EXECUTE A GAR. I WAS NOT MENTALLY PREPARED/PRIMED FOR THE GAR OP AND IT REALLY NEVER ENTERED MY MIND. I AM PROFOUNDLY EMBARRASSED; AND FRANKLY APPALLED; AT THE MANY LAPSES IN JUDGEMENT AND SKILL I DISPLAYED DURING THIS FIASCO.