well TS:
if you just want to mend his wounds and stick by your decision
to reject him, just send him another msg telling him your reasons
and what you expect him to do next.
For instance the steps or action to remain as friends and not
MIA totally.
I have had an similar experience like yours years back. The only
regret I had since then was not able to remain as friends after
which.
Just send an email telling him what your feel and just remain
friends. Time will tell if he's sincere about his feelings towards
you.
By MIA, he's just isn't man enough. A man is to stay and face
the consequences regardless of the results, there he is running
away. Sigh..
Make a wise decision.